added support for wiki:config options in gallery.xql and gallery_new.js
fixed wrong input name "height" in html-edit-gallery.html to "align"
added global option in configuration.xml to enable/disable slideshow feature
added new function in gallery.xql and config.xqm related to sildeshow enable/disable feature
Merge branch 'master' of https://github.com/wolfgangmm/AtomicWiki