added: variables and functions can have underline characters in their names git-svn-id: svn://ttmath.org/publicrep/ttcalc/trunk@62 e52654a7-88a9-db11-a3e9-0013d4bc506e
added: variables and functions can have underline characters in their names git-svn-id: svn://ttmath.org/publicrep/ttcalc/trunk@62 e52654a7-88a9-db11-a3e9-0013d4bc506e