* some more warnings removed
* preventing frame < 0

* fixing some warnings

* adding checkboxes to opening dialog
* renaming callbacks
* callback also on empty path
* hiding file selection when switching tabs
* video info for MP4s
* smaller fonts

* find sphinx, add docs target

* fix continuous refresh

* quiet setting for conda prefixes
* updated documentation
* fixing one possible crash

* renaming heatmap parameters

* removing some references to temporary objects (bad bad)

* adding variance heatmaps

* redrawing consecutive in all frames could be performance relevant