Merge pull request #1 from vlukes/master

simplify paths and filenames
Merge pull request #2 from vlukes/master

Update PYSEG_BASE name and links in README and INSTALL files
Merge pull request #3 from vlukes/master

fix 'draw' mode
Merge pull request #4 from vlukes/master

fix reset() function in seed editor
Merge pull request #5 from vlukes/master

fix LICENSE file
soft exit
set seeds
SliceTickness is not voxel depth.
Merge pull request #6 from vlukes/master

fix INSTALL filename, improve seed editor
Merge pull request #7 from vlukes/master

fix initialization of volumetric erase mode