Datalogstatus notification implementation (as discussed: https://www.howtoforge.com/community/threads/datalogstatus.73719/)

When uploading a logo which is smaller than the current ispconfig one, then the logo will be on the left side of the header. In my opinion it will look better when it's centered.
You could vote about it ;)

Fixed issue #3955 DNS module: Limit for maximum zones can be circumvented with "import zone file" function.
Removed TODO string in error template.

- Fixed mailuser login

- possible sql injection in monitor sys_state

- removed most static content from scrigo

- cleaned up some javascript

- Responsive fixes

- Select2 combobox

- New dashboard layout

- Added HHVM to "Default PHP Handler" field (server configuration).
- Fixed "Unable to load the server configuration from database." error when running server.sh.
- Fixed Javascript (accordions weren't working anymore, directive snippets and other placeholders couldn't be added anymore).