omp'd hamming stringdist
better recycling under multithreading. needs work on edge cases
solved edge case where nthreads < length(x)
completed paralellization of stringdist/hamming
paralellized stringdist/dl
added Makevars
parallelized stringdist/jw
parallelized stringdist/lcs
paralellized stringdist/lv
parallelized stringdist/osa
paralellized stringdist/soundex
bugfix in parallel soundex
thread-safe error handling in stringdistances
made memory allocator for qgram-like distances thread-safe
paralellized stringdist/qgram
merged doc changes
stringdistmatrix uses multithreading
updated docs. set default nthreads
parallelized amatch/dl
paralellized amatch/hamming