Fixing bug related to incorrect unloading of shared library and class code.

Fixing bug related to incorrect unloading of shared library and class code.
This is related to:
https://savannah.cern.ch/bugs/?58083
https://savannah.cern.ch/bugs/?58247
In actual fact this is a workaround for the bug/feature/limitation (whatever you want to call it) in ROOT/CINT that removes more libraries than just the one that was
requested to be removed. The problem has been solved by adding more protection to prevent the segfault, printing of appropriate warnings and cleaning up HLT components in
the correct order to prevent the problem in the first place.