Limit the search in processSequenceButtons to outermost sequence.

This fixes deform issue #197
Add changelog for PR #198
Merge pull request #198 from martin-sucha/upstream-issue-197

Limit the search in processSequenceButtons to outermost sequence.
Replaced offensive word in deform.Field docs

Replaced "unmolested" which sounds offensive, with "unmodified".
Merge pull request #235 from lgp171188/master

Replaced unusual use of word in deform.Field docs.