* Added avatar support: tries really hard to display an avatar associated

  with a BBS entry (only for ANSI users), prioritizing the sysops listed
  in the entry, then the creator (for network-imported entires). For
  locally created entries, it prioritizes the creator's avatar.
* Fixes for non-ANSI terminal users:
- The List and More prompts were too long (shortened for non-ANSI)
- There was no selected item indicator, added an arrow (<) selector
* Fixed error (bbs undefined) when removing the only BBS from a search
  result.