Merge pull request #243 from matthias-ronge/issue_168_rebased

Merge: Allow to map several metadata fields into one (#168) ⅠⅠⅠ
Merge pull request #249 from matthias-ronge/issue_246

[ZM] Merge: Create new structure element with page allocation failed (#246)
Merge remote-tracking branch 'matthias-ronge/issue_244' into feature-zm

Conflicts:
	Goobi/plugins/opac/PicaPlugin.jar
Automatically attach new pages to the first non-anchor struct
Merge branch 'issue_247' into feature-zm_all