refactors current user bookmark handling
Merge branch 'release/4.2.1' into develop
moves "Advanced Search"/"Simple Search" navigation to navbar #288
updates autocomplete attribute on password and username input tags
makes ignored postings more flexible by using a CSS class #287
code formatting
set X-Frame-Options header
update blackhole documentation #286

also pipe every request through security component to keep CSRF-token
active for as long as possible (a potential entries/add page is open)
bumps version string
improves CSRF documentation
adds current user to blackhole log
bumps version string
bumps version string
fixes regression in tree html structure
fixes empty thread box if thread starter is ignored
code refactoring
removes dead html tag attribute
bumps version string
Merge branch 'release/4.3.0'