improve tracing for tests

[florianschanda]

• All code in a "testing" directory (as indicated by a miss_hit.cfg should be flagged as a test)
• Otherwise, the following block properties indicate setup code and should also flag code as test:
  • TestMethodSetup
  • TestMethodTeardown
  • TestClassSetup
  • TestClassTeardown
  • TestParameterDefinition
• Auxiliary functions (in a test class or at the end of the file) should be flagged as tests
• New config parameter to defined how auxiliary code (all the above) should be treated by mh_trace
  • ignore (the default: exclude it all, never shows up in tracing)
  • include_when_tagged (don't show, except if there is a tag)
  • include (always include it)