Execute the complete test suite by calling RunTests.bat or RunTests.sh

When called without options, it calls poApps by executing "tclsh ../poApps.tcl".

It is possible to use the poApps Starpack by specifiying either "poAppsBatch"
(Windows) or "poApps" (Linux, Darwin) as command line option.

The following tests need an extra test directory with large images or
directories for comparison:
    Dirdiff_Diff
    Dirdiff_Search
    Dirdiff_Sync
    Imagediff_Large
    Office_Word

