fix error in cmake
Merge pull request #441 from ikolesov/update-KSlice

fix error in cmake
Merge pull request #440 from paulcm/update-LongitudinalPETCT

Added numeration in workflow steps collapsible buttons
BUG: change github url so that there will not be permission problem
Merge pull request #442 from gaoyi/update-RSSExtension

BUG: change github url so that there will not be permission problem
COMP: update-RSSExtension

fixed some build issues caused by typename in non-template files
Merge pull request #443 from gaoyi/update-RSSExtension

COMP: update-RSSExtension
BUG: update RSS extension.

1. fix a bug: the mask image is not init-ed to all 0, which causes problem

2. clean up some debuging code
BUG: fix a bug in computing kappa in RSS
Merge pull request #447 from gaoyi/update-RSSExtension

BUG: Update rss extension
FIX: Fixed typo in header include which caused Linux build error