Quick fix for: http://code.opencv.org/issues/2803

Native camera libs for MIPS installation fixed.

- libavcodec issue
- some decoders alter AVCodecContext width/height values, in a wrong way
- eg. in issue 2815, vp6f decoder changes these values, resulting in distorted / invalid frames
- this patch forces default AVCodecContext values

Manager verison incremented;
Additional constatnt for library intialization added;
Documents updated.