Because in 'patch1' the fraction of digits is only 1/6 it was failed to
be recognized as version. Rework version detection heuristic to
recpognize 'patch' and similar words as versions and increase ndigit
threshold - since we now do not need to keep it so low as 1/5 due to
e.g. slapospatched012 and similar cases.

Occured in Wendelin.