New plugin: Blue Banana color grading/correction filter

Blue Banana offers slider-based range and non-linear (gamma)
adjustment for red, green, blue, hue, saturation and value.  It
provides feedback both through the compositor window and realtime
color histograms embedded in each adjustment slider. It can operate
on the entire frame, select specific subset of colors, the current
masked region, or a combination of a selection and a mask. It is also
able to highlight the selected region with a marching zebra.

Commit 5129a9c43dfc6fa762527e749e6756fb7e48ad23 from
http://git.xiph.org/?p=users/xiphmont/bluebanana.git;a=summary
Release fonts on closing main window

Plug the leak by freeing the fonts in the destructor when destroying the main window.
Then the font structure is freed during closing the last window.

The change is discovered and tested in valgrind.
Avoid casting away const qualifier in byteorder detection code

Killed warning: "cast from type 'const char*’ to type 'u_int32_t*'"
The code return 1 if little endian and 0 if big or middle endian.
Include <stdlib.h> to find free() in libmpeg3 code

Killed warning: "incompatible implicit declaration of built-in function 'free'".
Make guicast/stringfile.C handle longer length

Fixed a bug in the calculation, by including the indentation when
figuring out if there is room enough, and dropped an unused variable.
Clean up Debian package build rules

The build dependencies were slightly outdated.
All the build dependencies are present in Debian Jessie (next future version),
but not using the correct package names.
Updated debian control file to reflect CV status and updated email list

The control file in the debian folder still reflect the roots in hvirtual,
and has the old email for the listserve. This patch fixes both.
Update copyright note in debian folder

This patch provides a more meaningful and updated copyright note in the debian folder.
Updated debian rules file
Updated changelog debian file

The debian changelog refered to this as the hvirtual build package.
This patch changes it to cinelerra-cv, updates the version number (rather old)
and refers to the current git.
Merge branch 'master' into silent-build