Md5sum.py: simplify the md5sum function by combining the two md5sum_hashlib and md5sum_md5 functions (now removed). Also updates to docstrings.
Md5sum.py: simplify the md5sum function by combining the two md5sum_hashlib and md5sum_md5 functions (now removed). Also updates to docstrings.

fw1121/genomics,fw1121/genomics,fw1121/genomics,fw1121/genomics,fw1121/genomics