- Added support for `-F configfile'. This enables using a specially
crafted muttrc for automated testing.
- Centralized call to _get_cword
- Used _get_pword
- Specified non-wordbreak characters to _get_cword() & _get_pword() for
bash-4.
- Added automated tests for -f and -A
- Fixed test suite's assert_complete() (test/library.exp) to drop only
the last element