Q Variants of QF algorithm - QF53, QF72, QF82

[nishihatapalmer]

• this is very fast on low alphabet longer patterns.
• it is the natural evolution from QF43 and QF62 which both have a table size of 2 ^ 12.
• QF82 has a table size of 2 ^ 16, and sufficient size of q-gram to work well on low alphabets.

[nishihatapalmer]

Added Q = 5 and Q = 7 variants too.

I have picked the bit shift parameters to ensure we keep a large table size, so QF53 gives us 2 ^ 15 table and QF72 gives us 2 ^ 14 table.