Time Stamper: fix indentation, white space and coding style
Time Stamper: fix floating point comparison bug
Time Stamper: make plugin an ExtendedPlugInFilter

This allows for a cleaner way of showing a dialog and canceling the
processing.
Time stamper: remove unneeded member field
Time Stamper: allow stack and hyperstack processing
Merge branch 'fix-time-stamper' from Tom Kazimiers' repository

The 'fix-time-stamper' branch addresses the issues mentioned in bug 513:

	http://fiji.sc/bugzilla/show_bug.cgi?id=513

Tom's repository is located at

	https://github.com/tomka/fiji

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>