TestRunner / logger do not detect failed linking

[racoltdev]

If I keep the library files local, rather than in a system library dir, and try to run raColTest with LD_LIBRARY_PATH, the tests will pass while producing a linking error.

Collecting tests.......
	Collected /home/andy/Programs/racoltest_Example/test/main.cpp
Executing tests........
	Executing testbin/main.........
testbin/main: error while loading shared libraries: raColTest.so: cannot open shared object file: No such file or directory
		

Finished executing tests

All tests passed successfully.
Build successful!

This should log an error and generate a fail status for the test suite.