* c-exp.y (yylex): Add tempbuf, tempbufindex, and tempbufsize,

	* c-exp.y (yylex):  Add tempbuf, tempbufindex, and tempbufsize,
	which together maintain a dynamically expandable static buffer
	for the lexer to use when translating C strings to their internal
	form (other future uses possible).  Fix parsing of C style strings
	to do the normal C style input conversions of escaped character
	sequences.
	* valops.c (value_string):  Remove translation of escaped
	character sequences, now done in C expression parser.