merge SVN commit 1104397 by winterz:

take a totally different approach to dealing with edited, inplace reminders.
no longer care about the incidence's revision or last-modified; simply search
for the uid already being shown. if so, reuse it.
kolab/issue4203

svn path=/tags/kdepim/enterprise35.0.20100312.1102367/kdepim/; revision=1104398