tools: call g_set_prgname() before doing the option parsing

tools: call g_set_prgname() before doing the option parsing

g_setprgname is implicitly called by g_option_context_new() with a check
to see if it's been set already, so set it before g_option_context_new()

Move version printing back until after the options have been parsed,
otherwise it won't work, since it evaluates a flag set by the
option parser.