Partial rewrite.
Changes too numerous to list (see the man page).
Highlights:
- Added -quotes.
- Added support for navigating between tests via right/left.
- Now store the user's position within a file if one is specified.
- Improved documentation.
- Added support for custom word lists (`-words).
- `-theme` now accepts a path.
- Added `~/.tt/themes` and `~/.tt/words`.
- Scrapped ~/.ttrc in favour of aliases/flags.
- Included more default word lists. (`-list words`)
- Modified -g to correspond to the number of groups rather than the group size.
- Added -multi
- Added -v
- Changed the default behaviour to restart the currently generated test rather than generating a new one
- Added a CHANGELOG :P
