Feature/issue 508 copyright

(This is a no-code, no-build request, so can just be merged when reviewed.)

#### Summary:

Clarify licensing terms that each developer (or their assignee) holds copyright for their own work.  This was also changed in the manual as part of the manual updates.

#### Intended Effect:

Just clarification to users.

#### How to Verify:

look at the added file

#### Side Effects:

n/a

#### Documentation:

n/a

#### Reviewer Suggestions:

Anyone