Modified header so unitTestDir is not hardcoded.  Instead it is determined by a macro UNITTESTDIR_ABSPATH that needs to be supplied at compile time.
Added make variables to determine unittestdir absolute path. 5D5D5D5D This supplies a define needed with the compilation of testsFor_FunctionReplacer.  Remove EXE extension from binarires so makefile is unix friendly.  Added targets for FunctionReplacer binary that come from FunctionReplacerFrontEnd.