New CMake procedure with conflict detection.
**Here are the Git commit messages leading to this changeset:
Renaming exposed variables and user options. Renamed some macros.
Grouped macros, renamed commands variables, set version information in root CMakeLists.txt.
Renamed CMake var TEST_CONF_FILE_ENV_VAR to LIBBATCH_TEST_CONF_ENV_VAR.
Renamed config.h into libbatch_config.h. Windows bug fixes (Mainly inclusion of <time.h> and turning #ifdef MSVC into #ifdef WIN32)
Rewrote FindPThread.cmake. Installed export logic.
Extra dependencies for SWIG module. Add SWIG_MODULE_NAME property to avoid unnecessary rebuilds.
Enhance PThread detection. SALOME-like detection system.
SWIG: removed unecessary ADDITIONAL_MAKE_CLEAN_FILES.
SWIG and Python detection now using the new scheme.
Converted some CMAKE_xxx_DIR to PROJECT_xxx_DIR
Changed project name from libbatch to LibBatch
