update several mass constants, specifically massH is actually massH+
update several mass constants, specifically massH is actually massH+

Ignore-this: 6ff81741d24b589bd9b2e4e857228cf

darcs-hash:20100513041822-9241b-09c62917641911425d64bea08eeaf9d903c465ee.gz

tmcdonell/hfx,tmcdonell/hfx,tmcdonell/hfx