Improved content and layout of OFL button and tooltips (fixed the repeated lines)
Make text lighter and more in tune with practical steps
Added missing newline
Add some comments relevant to class kerning.
Add support for import and export of U. F. O. groups and group kerning rules.
Add missing destructors.
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Merge pull request #1774 from rrthomas/master

Remove HelpDir preference; fix ResourceFile fallback (#1769)
Merge pull request #1511 from n7s/OFL-tooltips

Improved content and layout of OFL button and tooltips
Merge pull request #1760 from fontforge/fontforge_ufo_groups_1

Add experimental support for U. F. O. groups and group kerns.
This fixes some copy and paste errors that Coverity discovered that I introduced in the recent groups.plist merge.
Fix Coverity defects.
Fix a missing return value.