Lock document that is opened for potential modification
Lock document that is opened for potential modification

Part of fix for bnc#805901. (No locking of documents edited through WebDAV.)
Seems to work, can it really be this simple...

I am a bit unsure if any explicit UNLOCK operation happens, but WebDAV locks
typically time out relatively quickly, don't they? And WebDAV implementations
(often/always?) have the possibility for a user to force open a lock.

Change-Id: Ia32d8b1517361f702b4f469d9f1aa17de6d7ba54

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core