Added Saturation statistics.
Merge from release 1.2
merge conflict.
Added HUE Calculation (uncalibrated)
Fixed HUE Median output.
Changed instances of values to signalstats.
Merge branch 'chroma_stats'
Change values part of hue stats to signalstats.
Head switching filter now highlights only matching pixels not entire line.
add descriptions for signalstats_options
initial draft of signalstats filter documentation
initial draft of signalstats filter documentation
Merge branch 'remove_head_switching'
Removes headswitching filter.
remove usage line on depreciated head filter
rename RANG to BRNG

to presume broadcast range
clarify description
add missing @end example in doc/filters.texi
remove references to depreciated HEAD test from docs
update rang to brng in docs
add self to copyright