Switch to PC-Style keypad

http://www.xfree86.org/current/ctlseqs.html#PC-Style%20Function%20Keys
Fix keypad "DEL" when in numlock mode
Cleanup
AutoWrap mode implementation
AutoWrap tests
Merge pull request #29 from Plonk42/keypad_fix

Keypad fixes
Merge pull request #30 from Plonk42/autowrap

AutoWrap mode implementation