Merge pull request #3 from danlurie/master

Wording / Organization Changes as of Morning May 24
updated the show button call in subject list listbox
Re-organized the Segmentation page and re-worded most options/tips
Re-organized and re-worde Registration.
Re-organized and re-worded Centrality
Merge branch 'master' of github.com:RanjitK/CPAC_GUI