on the passed path...
For fexist() simply return TRUE if access()!=-1 && !isdir()
For fexistcase() *try* the access()/isdir() method first, then do the full
search.  Should make a reasonable difference.  Profileing suggests that
iniFileName() is quite slow due to the fexistcase() calls.  As the general
case is that the passed path is correct, this should speed up most calls
to fexist*().