deep versioning changes changes and refactorings (see details)

- attribute and link instances preserve identifiers under versioning
- definition sharing is preserved under versioning
- definition terminology alignment around attribute and link definitions
is not complete
Merge branch 'dev' of https://github.com/cotrix/cotrixrep.git into dev
refactoring for further naming alignment, test refinements
changelog detects relevant attribute and link changes
Shared definitions now version correctly.
Merge branch 'dev' of https://github.com/cotrix/cotrixrep.git into dev
oops, test fix.