The LO process is called just "soffice" on OS X

Change-Id: I74a6af7f4dc49ccf8ff3ead0d5b3e5e9b78b4f7a
The "shared" extensions are read-only in the OS X sandboxed case

Change-Id: Ie0e41ad5a5498d24a91da80dd7cc461b7fb5fa3b
Don't do the annoying restart thing when sandboxed on OS X, ignore risks...

So far we have just displayed a hugely annoying dialog "sorry, but we
suck, you need to start LibreOffice again". But that sucks. So just
try to do without restart then, and let's see what happens. At least
in trivial testing, no crash.

Change-Id: I475fe49a0fdb8086bb33a165a08b32ac46548857