Merged r7857:7898 from n4hy/msddLTS into trunk, with modification. Adds gr-msdd6000 component, providing GNU Radio source and sink support for the Softronics Ltd. MSDD 6000 receiver.

git-svn-id: http://gnuradio.org/svn/gnuradio/trunk@7904 221aa14e-8319-0410-a670-987f0aec2ac5