Add lists of less common FLEx fields to Entry, Sense, and Example levels
Merge remote-tracking branch 'lf/feature/flexfields'

Conflicts:
	src/angular-app/languageforge/lexicon/views/configuration.html
Merge remote-tracking branch 'lf/master' into feature/customFields

Conflicts:
	src/angular-app/languageforge/lexicon/views/configuration.html
	src/models/languageforge/lexicon/config/LexiconConfigObj.php