Add remaining changes

Behavior is as before; e.g. if both a single group name and
a single test name is given, both must match.
Fix usage message (no IGNORE_TEST)
Merge pull request #407 from arstrube/filters-6

Multiple -sg and -sn Commandline Parameters - Step 6
First shot
Merge pull request #412 from arstrube/readme

Bringing README_InstallCppUTest.txt uptodate
Merge pull request #408 from arstrube/filters-7

Multiple -sg and -sn Commandline Parameters - Step 7