dropped supported_letter_types function
dropped supported_letter_types function

also cleaned up comments
cpcloud/numba,stonebig/numba,stuartarchibald/numba,gdementen/numba,gdementen/numba,seibert/numba,jriehl/numba,stefanseefeld/numba,stefanseefeld/numba,IntelLabs/numba,pombredanne/numba,stuartarchibald/numba,seibert/numba,pombredanne/numba,gmarkall/numba,stefanseefeld/numba,gmarkall/numba,stonebig/numba,numba/numba,stonebig/numba,pitrou/numba,GaZ3ll3/numba,cpcloud/numba,stuartarchibald/numba,stuartarchibald/numba,stonebig/numba,seibert/numba,stefanseefeld/numba,GaZ3ll3/numba,gdementen/numba,numba/numba,IntelLabs/numba,ssarangi/numba,jriehl/numba,numba/numba,numba/numba,GaZ3ll3/numba,ssarangi/numba,GaZ3ll3/numba,seibert/numba,gdementen/numba,IntelLabs/numba,seibert/numba,GaZ3ll3/numba,ssarangi/numba,sklam/numba,gdementen/numba,stonebig/numba,pitrou/numba,gmarkall/numba,cpcloud/numba,jriehl/numba,pombredanne/numba,ssarangi/numba,stefanseefeld/numba,sklam/numba,cpcloud/numba,gmarkall/numba,pombredanne/numba,gmarkall/numba,pitrou/numba,IntelLabs/numba,jriehl/numba,IntelLabs/numba,sklam/numba,pitrou/numba,numba/numba,sklam/numba,stuartarchibald/numba,sklam/numba,ssarangi/numba,jriehl/numba,cpcloud/numba,pitrou/numba,pombredanne/numba