documentation formatting
Remove unused getMatrix functions, since icpc warns about them.
Do image inverse in double precision to prevent 1.e-7 occasional level errors in ImageF's.
For explicit conversion of image arithmetic to the correct type to make g++ happy.
Put CHANGELOG in order by issue number.
Fix the scons build for bug in scons <= 2.0.
Correct oversight error in test_shear.py
some preparations for tagging v0.5
(#439)
changelog, history updates post-tag of v0.5
Merge branch 'master' into #325