Fibonacci regex, fast: Apply a dramatic speed optimization; length+=9

This optimization was devised by teukon. It results in a huge speed-up, and makes the previous speed optimization less important (but still significantly helpful)
Fibonacci regex, fast: Move parity into first capture group; length+=6

This allows the multiplication optimization to be done more naturally. A way may be found later to make up for the added length.

This change has virtually no effect on speed.

Note, this change allows the main algorithm to successfully match 13, so this has been removed from the bottom, making it 2 characters shorter there.
Fibonacci regex, fast: Rename this version to reflect its intent
Fibonacci regex: empty commit to get the merge to work
Merge branch 'speed-optimized'