Changed algorithm to speed up fixSingleBitErrors() and fixTwoBitsErrors().
Old: Modify mesage, recalculate CRC, compare until a valid solution is found.
New: Calculate CRC, identify incorrect bits bits, correct message.
No recalculation if CRC is needed. Allows fixing of two bit errors on "slow" systems like RaspberryPi.
Changed algorithm to speed up fixSingleBitErrors() and fixTwoBitsErrors().

Merge commit 'refs/pull/50/head' of https://github.com/antirez/dump1090