** Create the tree of directories in which zFilename belongs, if that sequence
** of directories does not already exist.
**
** On success, return zero.  On error, return errorReturn if positive, otherwise
** print an error message and abort.
*/
int file_mkfolder(const char *zFilename, int forceFlag, int errorReturn){
  int i, nName, rc = 0;
  char *zName;

  nName = strlen(zFilename);
  zName = mprintf("%s", zFilename);
  nName = file_simplify_name(zName, nName, 0);
  while( nName>0 && zName[nName-1]!='/' ){ nName--; }
  if( nName ){