Enforce alignment adaption in merge tool

[westram]

Before the merge tool allows to merge species it should enforce an alignment adaption check (similar to the enforced rename-check) including:

• search for species occurring in both databases (using shortname)
• check whether the alignment of these species differs between DBs
  • if different the column transformation (TT) needs to be checked.

Check TT for..

• complete coverage: each source-column (which has data) has to be defined in the TT
• conflicts: all ambiguous source→dest column-assignments

If conflicts and/or missing coverage are detected

• warn that merging is only possible at the expense of alignment quality
• display information about affected column-ranges
• require that confirms that he understood the problem and would nevertheless continue at his own risk (set a toggle)