Testskript noch besserer, SHA1 fixed

When clang wants to produce a object file, we save the hash to the file

     <object-file>.hash

The getDigest implementation finalized the SHA1 hash. For this the
internal state was changed. Therefore calling getHexDigest produced a
different hash each time.

Mal wieder gucken

multiple_args

Mal gucken

Noch besseres Testskript

The run-test script had a race condition, were another tester thread
could delete the generated source file of another test through an
invalid glob pattern.

Additionally, the error messages and colors were adjusted.