- Cleaned up client introduction & exit code, & some structures.

- Cleaned up client introduction & exit code, & some structures.
  - Removed some tanerisms and orabidooisms.
  - Removed server name pointer in user struct, it is redundant.
  - Removed scache - glines are the only thing we use it legitimately
    for now and it isn't justified for a permanent memory leak.
  - Fixed exit_client double freeing issues as in -7 and hopefully
    fixed all the issues exiting now causes.
  - Moved ->fd into the LocalUser.
  - Call read_packet() immediately when auth comes through, as in -7, so
    we don't stall on sigio.