* Fix the division when computing \numrows, sometimes subtract 1 (when
  division was exact), sometimes don't (division wasn't exact).  No
  remainder operation in TeX, so have to multiply the result and compare.

* Fix the width/height/depth sizing (and placement) of the main widget when
  tiling.

* Make tiling be optional parameter to \includeanimation.
* Similarly the number of frames per tiled row.
* Similarly the n-th frame to show when tiling.

* Allow optional width=,height=,scale= parameters to \includeanimation.
  When specified, use those dims instead of the detected fullframe ones.

* Resolve "flashing" issue during animation with large bitmaps on slow
  computers and/or Linux acroread.

* Avoid repeated JavaScript code by using TeX macros.

* Figure out a way to detect the number of pages in the PDF frames file, so
  that the number of frames/pages (or frame/page range) is optional.

* Allow Play/Pause by clicking on the figure?

* User customisable \frametext ?
* User selectable bottom left or bottom right corner for \frametext.

* Make forcing of g.dirty = false be optional, since it's particularly
  savage and not ideal for everyone.

* Widget background colour optional parameter to \includeanimation.

* Generally clean up.
  * Remove blank space which isn't properly commented out.
  * Put @ into all internal control sequence names to properly hide them.
  * Replace any remaining explicitly named registers with \newxyz versions.

* Write some decent docs and demos.