PJ: remove Jfile, Rfile, Tfile, and memory management.

- gb_seek_fcel_frame: always reopen file.
- show_fli_info: should report err = size, rather than err = fh.size.
PJ: remove FFILE and LFILE.
PJ: remove add_check_tflx_toram and rem_check_tflx_toram.

These were originally responsible for automatically moving files
between disk and ram.