backport of #11478

add checkbox for experienced users to server tab

must be empty not auto

sets user filters to raw mode when marking user as experienced

Objectlasses, Groups and Attributes are now loaded only in assisted mode and only once

user and group counts are only upated on demand in experienced mode

confirmation before switching to assisted mode when admin is experienced

rename internal var name to avoid collision

more beautiful white spaces

smaller corrections to make scruitinizer happier, no effective changes

bump version

fix triggering of group update counts. improves the basic code which is also responsible for user counts. i did not find regressions, please doublecheck

remove debug output

coding style, no effective code changes

always abort running ajax request when the method is fired up again

show a spinner next to test filter button when the test is running

show Spinner when stuff is being saved

show busy cursor and lock tabs on save

instead of dis/enabling tabs on save, cancel tab change. avoids noisy ui

remove debug output

rephrase xp'ed user mode label

left-align checkbox on server tab