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The player back widget allow users to :
* load severals scripts
* play all the scripts
* stop/pause/play step by step one script
* give feedbacks to the users

All players are now QObject so that it's possible to retrieve the
associated class name using the metaobject. This required to provide
feedback associated with the newly introduced event type "comment".
(See pqCommentEventPlayer)

The delta associated with Qt Mouse Wheel is sometimes greater than 120
(for example when the wheel is turned very fast). This is expected.
From our observation, it seems additional event are also emitted/recorded.

Further investigation are needed to exactly identified the issue.
The CTK issue #132 will allow us to track that problem.

Timers cause major issues with the test playback since they may not timeout as
tests are being played back, but the tend to when user is using the application.
To avoid such issues, we now add mechanism to register such timer with the
pqEventDispatcher.

QTest code uses notifyEvent() to post events. That being the case, it may be
more appropriate for our testing code to use notifyEvent() as well. This may
improve test playback reliability across platforms.

With Qt 4.8, we have started seeing change in the order of the
tab-widgets created for docked panels. That results in the names not
aligning to the ones used while recording the test. In that case, we
can attempt to locate a sibling tab-bar that has a pane with the expected
name. If none is found, then alone do we give up.

pqTabBarEventPlayer still supports old-style test scripts that use indexes for
tab widget.

When QT_TESTING_INSTALL_DEVELOPMENT is on, also install the headers,
instead of (in the installed QtTestingConfig.cmake) referencing them
from a combination of the source and build directories.

find_package was unable to find the QtTesting library due to the
installed .cmake having the wrong QtTesting_LIBRARY_DIR ("lib", rather
than the full path). Fix by determining the full path, and writing that
to the installed .cmake instead.

The timer calling quit on the event loop would be called before the exec happend

3D view recording/playback is generic and works off a given class name.

pqTestUtility has methods for an application to add data directories.  If a file is opened or saved from under a data
directory, a label for that directory is recorded.  Playback reverses the label to an absolute file.

Fix playback to do lookups for menu items the same way they are recorded.
Improve menu recording/playback for items that are not named.

Because you can't use Qt processEvents method and have tests play properly we need a proper replacement.

This should help diagnose if timeouts occur due to a hang or just a slow test.

Allows control over installing headers and cmake development files.

If you want to check for events in an XML input using a flag would
probably be the best way to go.

pqBasicWidgetEventPlayer was not correctly generating mouse move events,
and they were silently dropped by Qt. These should now be propagated as
expected in normal Qt widgets - verified with the Avogadro QGLWidget
derived 3D widget.

By default this setting is 100 miliseconds. One can overide this setting on machines where this delay is not enough resulting in test playback to raise events faster than the gui can respond.

Add QtTestingConfig.cmake (in both build and install flavors) so a
stand-alone QtTesting build can be used by other projects.