support for multiple libraries in the IRDB

libIRDB/include/core/file.hpp

libIRDB/src/core/fileir.cpp

libIRDB/src/core/variantid.cpp

libIRDB/test/fill_in_cfg.cpp

libIRDB/test/fill_in_indtargs.cpp

libIRDB/test/fix_calls.cpp

libIRDB/test/ilr.cpp

tools/meds2pdb/meds2pdb.cpp