Renaming cryptohashes.c to cryptohashfuncs.c

Hi all,

Now that the tree has a new set of files for cryptohash functions as
of src/common/cryptohash*.c, it is a bit weird to have another file
called cryptohashes.c for the set of SQL functions.

Any objections to rename that to cryptohashfuncs.c?  That would be
much more consistent with the surroundings (cleaning up anythig
related to MD5 is on my TODO list).  Patch is attached.

Thoughts?
--
Michael