stacktrace on SEGV etc in vtk cxx tests

For cxx test builds containing debug info generated by a
supported compiler on systems that support POSIX signals
catch some common signals (SEGV,TERM,FPE etc) and print
a stacktrace.

Change-Id: I041432992215c9a8586f0f558ad467b721066402
stacktrace on SEGV etc in vtk python tests

For python tests in builds containing debug info generated
by a supported compiler on systems that support POSIX signals
catch some common signals (SEGV,TERM,FPE etc) and print
a stacktrace.

Change-Id: I8762c043f28196000852574af1a5bc226f0e02c8
Merge topic 'stacktrace-for-vtktesting' into master

c0ae834c stacktrace on SEGV etc in vtk python tests
de509c2b stacktrace on SEGV etc in vtk cxx tests