bugfix: backwards search is working now.

The reorganization of the search functions left backwards search in a
broken state.  Now it is fixed.

	modified:   src/filebuffer.rb
bugfix: more robust "write_message" method

Make sure it doesn't  choke on non-strings.

	modified:   src/antsy.rb
bugfix: trying to handle weird character on bare unix console

Better raw character handling.

	modified:   src/antsy.rb