gui remembers last path, adds .prog extension to saved progs
Fix javabite backend classpath in M2CrossTest
Fix build.xml for cross tests
Fix 2 for build.xml (cross tests)
expanded lexer test cases
expanded lexer test cases 2.0
refactoring
added some new example progs
fixed new example progs
fixed new example progs 2.0
Compile array integration tests without analyser
Remove return bool tests

As the compiler does not implement functions yet, the return statement is
effectivly the exit code of the implicit main functions. As OS'es usually
allow only positive natural numbers as exit codes, only returning longs
is specified and implemented yet. Therefore the returnBool tests have been
removed.
Added M3 test bodys (ignored)
Introduced ProductionTest; tightened and cleared the test packages
Next step in clean up
Further JUnit tests
Merged code/common changes
Small fixes
Test fix...
Adjusted error messages