It closes all db connections if the new local path is a already
synced folder path.

After trying again immediately for 3 times, no more fast follow-ups
are run until a sync finishes without needing a fast follow-up.

Previously when a sync failed, we'd retry very soon (30s) no matter how
often a sync had failed before. After this change we'll retry twice and
then back off to the regular 5min interval.

In e5269a41 I moved the reset calls to
before the first bindValue() because we didn't consistently reset()
after exec().

However, some queries may keep a lock on the database so it is necessary
to reset() as soon as the data is read. This commit reintroduces these
reset() calls.

We will revert this once #2388 is implemented

RegDeleteKeyEx does not exist on Windows XP 32 bit

Fixes: #2165

There also was a bug in syncjournaldb: in some error conditions the
sql query wasn't reset properly. We now always reset a query before
calling bindValue.

Project file names stay the same, only the output file(s) changed

This fixes bug #2299

Fixes #2335

Issue #1931

update and reconcile happen in different threads. This code is safer.
(Even though depending on sqlite3 version it should work anyway)

(Introduced because of bad resolution of merge conflict
in my last commit)

The shared symbol would not appear if the status came for estimateState

Also added the shared symbol for the Shared/ directories (owncloud 6 compat)

Task #2088

Task #2283