Remove StFmsPhoton xyz member

Directional information is already encoded in the 4-momentum.
Change x and y to store x, y in global coordinates instead of local so
they are still readily available.
Delete unused headers from StFmsPoint
Pass TLorentzVector argument by reference
Remove StFmsPoint::Print method

Never used for anything
Remove StFmsPoint stream insertion operator

Never used for anything
Add Doxygen comments to StFmsPoint
Fix include paths and style to match cpplint guide
Fix header guard style to match cpplint guide
Remove ClassImp from StFmsPoint

This is now obsolete in ROOT unless generating THTML documentation,
which we are not
Make whitespace/layout tweaks in StFmsPoint