* Reworked Processor object.
* optimized the number of thread used by the application (limited on
win32 JVM).
* added ThreadUtil.runSingle(..) to run a single instance of a process
(same as the previous bgRunSingle()).
* SequenceUtil.scale(..) now correctly update pixel size information.
* fixed XLSUtil error message.
* cleanup
minors changes.
* reverted some changes with thread optimization (don't optimize too
much ^^).
* others minors fixes
* added safe ROI export (wait for calculation to complete).
* fixed small memory leak with VTK panel.
Not a good idea to make asynchronous ROI excel export, back to previous
code.
* fixed refresh issues regression on layer panel.
* faster cancel operation of the search bar.
* minors changes on error handling in PluginClassLoader
minor improvement on ROI panel refresh.
fixed possible memory leak
* Simpler image resize operation (no more pixel size info).
* Processor: can choose to handle the exception in task with the
IcyHandlerException object.
* minor change for more generic filename