Merge pull request #37 from roughhawkbit/master

Utils.ExtraMath cleaned up. Checked Through 221013
Fix XML syntax error in env_Sum file
Merge pull request #39 from fophillips/bugfix/xml-error

Fix XML syntax error in env_Sum file
Merge pull request #38 from roughhawkbit/master

Warning message if array empty
Changes to ContinuousVector required for eGUT epithelium. 1. Now
implements Comparable so that two CVs can be compared. 2. Implements the
required "compareTo" method.
Merge pull request #41 from kalden/master

Changes to ContinuousVector required for eGUT epithelium.
Merge pull request #1 from kreft/master

Fetching upstream changes