Collection base easylist rebased

[rozyczko]

This is the collection list as described in #226
Rebased against the new develop branch and due to the number of files affected, made a separate PR.

For discussion look in: #226

[rozyczko]

Another question:
Currently, the code allows backward compatibility, so old Parameter and Descriptor objects can be used alongside the new ones based on NewBase.
Does it make sense to keep this compatibility layer for the interim process or should we completely forget about ObjBase derived classes?

[rozyczko]

Another question: Currently, the code allows backward compatibility, so old Parameter and Descriptor objects can be used alongside the new ones based on NewBase. Does it make sense to keep this compatibility layer for the interim process or should we completely forget about ObjBase derived classes?

I don't think it makes sense to carry over functionality which will be removed in the next release.
Removed all vestiges of BasedBase dependencies, inclusing methods for backward compatibility with the old ModelCollection.