* Add numeric inputs for percentiles
* Define initial values for percentile cutoffs in world reducer
* add percentil to crossfilter dimensions
* worldEqUniverse now handles cloned worlds
* add Dataframe.mapColumns
* Wire up handlers for percentile inputs
* World reducer and stateManager know about continuousPercentileMin/Max
* Create world as universe clone (not pointer) to avoid clobbering vals
* Define basic actions for setting continuousPercentileMin/Max
* Under the hood, deal with percentiles between 0 and 1
* Move percentile inputs to visualization settings menu
* Fix padding for undo/redo buttons
* Trigger world rebuild from percentile actions
* BROKEN - pseudocode for clamping dataframe by percentiles upon world rebuild
* fix error handling on clip quantiles; start world clipping implementation
* more unclipped reorg
* rename crossfilter.percentile to quantile
* simplify schema access
* update continuous legend when scale changes
* update color cache when clip changes
* clip obs annotations and var data when clip quantile changes
* use own fromEntries
* fix tests
* stable non-finite float sort/search
* clarify comments
* fix syntax typo
* use new stand-alone clip
* clip expresssion data
* add select tests for non-finite scalars
* basic styles
* clip UI now requires explicit commit
* reset enable/disable accounts for clip percentiles
* better error messages
* fix bug in undo interaction with programatic min brush selection
* small refactoring
* support clipping of int data
* do not perform unnecessary summarizations
* improve caching of dataframe compiled columns
* add percentile precompute to Dataframe.summarize
* use Dataframe.summarize for clip percentiles
* remove obsolete quantile code from corssfilter
* histogram scale and label Y axis, add unclipped X range labels
* layout tweaks
* scatterplot now updates when clip changes
* improve comments
* remove debugging comment
* rework clip number entry validation for usability
* ui tweaks to histogram colors and layout
* enable undo/redo for clip user action
* refine UI on clip value entry
* api cleanup
* update confusing comment
* clarify purpose of isValidDigitKeyEvent
* fix misleading comment
* apply appropriate button-group classes; do not mix span and div
* variable name and comment changes suggested in PR review
* rename sort to sortArray; remove unused and dead code path
* naming changes suggested in PR review
* code review improvements for clarity
* more small changes from PR review
* lint fixes for PR review
* fix spelling error
* clarify that function performs in-place modification of world
* add comment to clarify intent of range operation
* fix bad indents in comments
* clean up __columnsAccessor comments and code
* improve comments around clipPredicate
* field name consistency
* improve comment on quantiles params
* initial dataframe commit
* initial dataframe port of core app
* rename variables for clarity
* remove unused import
* comment out unused code
* fix array handling bug in crossfilter dimension creation
* allow creation of empty dataframes
* handle non-existent columns
* handle non-existent columns
* revise tests for new dataframe
* comments for clarity
* comments for clarity
* generate bulk add placeholder with real gene names
* fix bug in gene name adding
* more dataframe unit tests
* fix bug - subset from current world, not universe
* put cut and pasted code into a single function
* improve caching of crossfilter
* remove cascading update bug from graph
* more performance work
* improve state handling for scatterplot
* performance optimization of critical path
* add column summarization
* dataframe utils
* add callOnceLazy
* fix tests
* minor updates found during review
* fix misspelling
* remove RESTv02 from function names
* comment cleanup
* cut/icut col parameter defaults to null
* break up large test
* improve tests and comments on dataframe at/has functions
* add Dataframe withCol/dropCol
* expression varData now stored in a dataframe
* dead code cleanup
* use dataframe.summarize()
* test cases for Dataframe.col.summarize
* update test cases for new dataframe summarize
* improve naming
* use new hasCol API
* add comments
* add more Dataframe.withCol tests
* add ability to specify row index in cut operation
* retire subsetVarData function
* correctly handle expression subsetting
* lint and improve comments
* rename cut to subset
* changes based on PR review
* initial dataframe commit
* initial dataframe port of core app
* rename variables for clarity
* remove unused import
* comment out unused code
* fix array handling bug in crossfilter dimension creation
* allow creation of empty dataframes
* handle non-existent columns
* handle non-existent columns
* revise tests for new dataframe
* comments for clarity
* comments for clarity
* generate bulk add placeholder with real gene names
* fix bug in gene name adding
* more dataframe unit tests
* fix bug - subset from current world, not universe
* put cut and pasted code into a single function
* improve caching of crossfilter
* remove cascading update bug from graph
* more performance work
* improve state handling for scatterplot
* performance optimization of critical path
* add column summarization
* dataframe utils
* add callOnceLazy
* fix tests
* minor updates found during review
* fix misspelling
* remove RESTv02 from function names
* comment cleanup
* cut/icut col parameter defaults to null
* break up large test
* improve tests and comments on dataframe at/has functions
