move admin deletion to Utils::Contract::recursively_lock_contract

and prohibit deletion of the currently used account
fix view on narrow screens

navigation menu did not appear
Don't fail installation if postinst fails.

It can happen that apache can't restart due to too little RAM. Make
sure to not bail out because of this.
Make modal header more generic.
Re-use ossbss logging config if available.

Otherwise, either panel or csc/ossbss doesn't log anything, depending
which is started first.
Bump debian version to 1.0.6 for 3.0 release.