The code does contain a cast that increases alignment but only in a
conditional that verifies the input is sufficiently aligned.

This CVS keyword was copied into the file with the rest of the
implementation.  It has no meaning outside its original project tree.

This converts the KWSys license to a pure 3-clause OSI-approved BSD
License.  We drop the previous license clause requiring modified
versions to be plainly marked.  We also update the KWSys copyright to
cover the full development time range.

COMP: Eliminate "conversion may change sign of result" warnings by using size_t where appropriate. (Missed one warning with last commit: add a cast to md5_word_t.)