Update src/python/xray.py

Just some small changes to Shotset.inter
added interpolation saving functionality
implicit save/load, polar/real masks
added specific shot loading
fixed unit bug in load_coor
oops
passing all tests
mask confirmed working
new test -- mask ref implementation
trying to get CPU scattering code to work with distutils
fixed setup.py for cpuscatter
ok leaving N
trying to debug
minor fix in shoot
merge
Merge branch 'master' of github.com:tjlane/odin
cleaning cpuscatter code  -- still not working
cpuscatter imports\!
cpu code working
single proc err fix