** Usage: %fossil help COMMAND
**    or: %fossil COMMAND -help
**
** Display information on how to use COMMAND.  To display a list of
** available commands one of:
**
**    %fossil help              Show common commands
**    %fossil help --all        Show both command and auxiliary commands
**    %fossil help --all        Show both common and auxiliary commands
**    %fossil help --test       Show test commands only
**    %fossil help --aux        Show auxiliary commands only
*/
void help_cmd(void){
  int rc, idx;
  const char *z;
  if( g.argc<3 ){