[Cin] Histogram Plugin add on feature

[Phyllis Smith]

The Histogram Plugin will function as it did but a new feature has been
added and checked into GIT.  The one default that has been changed is that
you can choose a Linear or a Log slider value.  It is set at the beginning
to 50% but if you want it to be the same as before, just set that slider
all the way to Log.

The easiest general procedure is to select the area on the timeline for
which you would like to see the Histogram averaged and then click on the
"Frames" button in the Histogram plugin.  Description of other changes:

Linear to Log slider - frequency in Linear range to Log range; default is
50%; original was always Log.
Frames button - if a Selection is set on the timeline, the number of frames
will be calculated and shown in the box next to it.
Frame Count box - type in the number of frames you want to be looked at
starting at the insert marker or use the up/down counter.
Clear Frames icon - reset the frame count to the default value of 0.

A side note - by using a number of frames, you can get a "dissolve-like
transition effect" which is interesting.
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