bugfix: ignore bad color specifications

	modified:   src/antsy.rb
bugfix: typo in set_cursor_color

	modified:   src/antsy.rb
cleanup: more descriptions in example config file

	modified:   scripts/config.rb
change backup file suffix to prefix.

Less cluttered directories.  Updated documentation too.

	modified:   doc/jedi.1
	modified:   doc/manual.md
	modified:   scripts/config.rb
	modified:   src/editor.rb
	modified:   src/filebuffer.rb