change order, key -> uid and value -> display name, this way it is also possible to have non-unique display names

first commit with some infrastructure code

add additional mail_smtp.. parameters to fix possible SMTP connection problems.

Fix rendering of database connection error page

Add two specific mimetype extensions (ebooks): for epub and mobi files

fixed an other typo.

Fixed type in line 70. Thank you for pointing me to that typo.

Remove unnecessary ob_end_clean() from template tests

Files encryption

Conflicts:
	apps/files_encryption/templates/settings.php