It fixes a warning about the use of db from the wrong thread.
Before, the default m_query object was created
in QHelpCollectionHandler constructor which caused the
warning to appear. Now we create m_query object
dynamically instead.

This also fixed a leak in QHelpCollectionHandler::openCollectionFile()
where two early returns, after the database had been opened, neither
closed it nor set m_dbOpened.

Change-Id: I24484d25d9d90b1a5d6fe4a5acb61c834e2b9599
Reviewed-by: Kai Koehne <kai.koehne@qt.io>
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>

If we only need registered documentations of a specific namespace we can
restrict the SQL query accordingly, so that we don't have to iterate
through all the results afterwards.

Change-Id: I124cf16ed95e1010b8a05d8cb723c2a1f03120d4
Reviewed-by: Jarek Kobus <jaroslaw.kobus@qt.io>

Change-Id: Ide8d1fb32e1e371716d5576d0f51771484463fb5
Reviewed-by: Karsten Heimrich <karsten.heimrich@qt.io>

Fix const correctness.
Use default member initializers.
Fix some coding style issues.

Change-Id: Ib89a2840648dcacc518cda4eb0ffce97ee8444cc
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
Reviewed-by: Karsten Heimrich <karsten.heimrich@qt.io>

Change-Id: I636e5c5d64955af60614684d71d220cda34758d7
Reviewed-by: Karsten Heimrich <karsten.heimrich@qt.io>

Replace foreach with for.
Remove java-style iterators.
Don't mix const iterators with non-const ones.
Use std algorithms when possible.
Fix const correctness.

Change-Id: I6519e490b6270f56b54f05867c6def5f140e57cd
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
Reviewed-by: Karsten Heimrich <karsten.heimrich@qt.io>

From Qt 5.7 -> LGPL v2.1 isn't an option anymore, see
http://blog.qt.io/blog/2016/01/13/new-agreement-with-the-kde-free-qt-foundation/


Updated license headers to use new LGPL header instead of LGPL21 one
(in those files which will be under LGPL v3)

Change-Id: I25237f97989d42da1130ed5c0839c31eb3904d34
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
Reviewed-by: Jani Heikkinen <jani.heikkinen@qt.io>

Qt copyrights are now in The Qt Company, so we could update the source
code headers accordingly. In the same go we should also fix the links to
point to qt.io.

Change-Id: I7f14f408e04c5c4f73a913fae153adcffbebe38f
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@theqtcompany.com>
Reviewed-by: Jani Heikkinen <jani.heikkinen@theqtcompany.com>

- Renamed LICENSE.LGPL to LICENSE.LGPLv21
- Added LICENSE.LGPLv3
- Removed LICENSE.GPL

Change-Id: I23ef9591f4d9054e0b6a252ba7767baf4189aeab
Reviewed-by: Jani Heikkinen <jani.heikkinen@digia.com>

Exclamation marks should usually be avoided in message strings (even in
error messages).
See also: http://qt-project.org/wiki/UI_Text_Conventions

 and other
HIG guidelines.

Change-Id: I0a4cc7c03cf64b130a2b32c1d77143e80e3e4024
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Reviewed-by: Karsten Heimrich <karsten.heimrich@digia.com>

Change-Id: I9b11dc8309c9739955e3acea12b564d6ad608f59
Reviewed-by: Akseli Salovaara <akseli.salovaara@digia.com>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Reviewed-by: Sergio Ahumada <sergio.ahumada@digia.com>

Change copyrights and license headers from Nokia to Digia

Change-Id: If89e41b25a242ff376eacdf8790957bcf499cc66
Reviewed-by: Janne Anttila <janne.anttila@digia.com>
Reviewed-by: Sergio Ahumada <sergio.ahumada@digia.com>
Reviewed-by: Lars Knoll <lars.knoll@digia.com>

As in the past, to avoid rewriting various autotests that contain
line-number information, an extra blank line has been inserted at the
end of the license text to ensure that this commit does not change the
total number of lines in the license header.

Change-Id: Ib4b7580dda53886247ad6eb10d17d8e67c51980d
Sanity-Review: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Rohan McGovern <rohan.mcgovern@nokia.com>

Replace Nokia contact email address with Qt Project website.

Change-Id: I3841a7c154b90b73fe8f498fda035c8b3545c692
Sanity-Review: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Rohan McGovern <rohan.mcgovern@nokia.com>

Change-Id: I89fb3609f49f9a4f1e7d658b05e212febcb14c94
Sanity-Review: Jason McDonald <jason.mcdonald@nokia.com>
Reviewed-by: Rohan McGovern <rohan.mcgovern@nokia.com>

Give the source code a somewhat saner structure while
I'm at it.

Change-Id: I99766405debe231a0562dd623ba1d17f19333656
Reviewed-on: http://codereview.qt-project.org/4829


Reviewed-by: Lars Knoll <lars.knoll@nokia.com>

Updated version of LGPL and FDL licenseheaders.
Apply release phase licenseheaders for all source files.

Reviewed-by: Trust Me

This is the beginning of revision history for this module. If you
want to look at revision history older than this, please refer to the
Qt Git wiki for how to use Git history grafting. At the time of
writing, this wiki is located here:

http://qt.gitorious.org/qt/pages/GitIntroductionWithQt

If you have already performed the grafting and you don't see any
history beyond this commit, try running "git log" with the "--follow"
argument.

Branched from the monolithic repo, Qt master branch, at commit
896db169ea224deb96c59ce8af800d019de63f12