Fixes for the Nektar reader plugin.

Fixes are:
1) Had to add in PLUGIN_NAMES so that the plugin would be
available through the Plugin Manager.
2) Got rid of a bunch of compiler warnings.
3) Suppressed overloaded virtual methods warnings.

Change-Id: I355d27ae2dff5bda0db1f02c191e70b7e512fac1
Fix compilation against libav 54 and OGG-Theora extension detection.

Change-Id: Ifc798efc68a41a6da14ecfdea5593941c79c7d8a
Merge topic 'ogg-support' into next

2cd0704 Fix compilation against libav 54 and OGG-Theora extension detection.
Improve Save Animation Settings Dialog

This removes the spin box from the start and end frame settings
and replaces it with a line edit. Also sets the default frame
rate for animations to 15 fps.

Change-Id: I907b303569aec97d1dc8c53c0655b77bb7d7f937
Merge topic 'save-animation-dialog' into next

e8ce209 Improve Save Animation Settings Dialog
Merge topic 'nektar_reader_plugin' into next

eb3fafe Fixes for the Nektar reader plugin.
Remove opacity from multi-block attributes test

This removes the usage of opacity from the multi-block attributes
test as opacity rendering is not supported on all dashboards.

Change-Id: If1fdb6ca0774f3615673a8f286a17fd434d9937f
Merge topic 'remove-multi-block-opacity-test' into next

18c7693 Remove opacity from multi-block attributes test