Squashed 'libertree-frontend-ramaze/' changes from 9ef1221..be94b56

be94b56 member API: disable invitations if disabled in conf
1bae427 new application setting to disable account creation
a453de5 new application setting to disable invitations

git-subtree-dir: libertree-frontend-ramaze
git-subtree-split: be94b56b547d95c553117c4ca9d617f1b976508d
Merge commit 'c6b0b482cc2f4341e69184456f46b1ed98ee983e'