Updated Merge Tool Part 2a of 2a/b

.. page flow and join sorted

.. committing before resolving the merging code
   - analyse() to identify offsets
   - combine() to merge into a working copy
   - ux for sliding offsets on a fullplot

.. next commit will complete this update to the
   merge tool

NOTE: MERGE IS NOT CURRENTLY WORKING SO PLEASE
      DO NOT USE IT !!!!