224. [cleanup] The entire project builds cleanly with gcc's
-Wcast-qual and -Wwrite-strings warnings enabled, which is now the default when using gcc. (Warnings from confparser.c, because of yacc's code, are unfortunately to be expected.) 223. [func] Several functions were reprototyped to qualify one or more of their arguments with "const". Similarly, several functions that return pointers now have those pointers qualified with const.