BUG: remove fiducial settings from the tutorial self test GUI

Remove left over code from copying the add many fiducials self test.
Replaced them with screen shot parameters to help with making the tutorial,
a check box to turn them on (off by default) and a slider to set the scale
(1 by default).
Tweaked the test: make sure that the fiducial list is named the same
as when a user would create one. Make the slices visible in 3D.

Issue #3328



git-svn-id: http://svn.slicer.org/Slicer4/trunk@22333 3bd1e089-480b-0410-8dfb-8563597acbee