* adding support for outputting a circos histogram file in "samtools depth".  Use the "-c/-B" options.
* adding support for outputting a circos histogram file in "samtools depth".  Use
the "-c/-B" options.

lh3/samtools,AngieHinrichs/samtabix,AngieHinrichs/samtabix,lh3/samtools,lh3/samtools,AngieHinrichs/samtabix,AngieHinrichs/samtabix,AngieHinrichs/samtabix