Merge pull request #2 from pkarasev3/slicer

cache variables, cleanup
making python connections
working
core gui ready
kslice in slicer
added bot
2d work
copy and paste, type of data volumes changed to short
need to add user input
added some debug scripts
testing pushing to IK
hook up seg3d test, fix up the sym links to data
test git
minor touches to understand module
add functions for binding observers, high priority so active during other editor effect
1337 setting of orientation type in kslice c++ depending on slice view
hook up the U going through into c++. but, why the spurious errors regarding invalid coords...
checkpoint
connecting UIvol works, need to improve U accumulation though
fix initialization issues, improve build sanity, runs on windows, remove opencv dependency, remove duplicate useless vtkKSlice* files. Temporarily comment out test because it needs boost program options.