Removed whitespace and added dtools/bin/remove-whitespace as a tool to do this in the future.

The sed script was provided by Moritz Fischer.

docs: don't need to distribute README files in docs component. Just the install path.

uhd: added some documentation to the UHD main page on standard option parser options and creating a source and setting the parameters.

docs: adding uhd Doxygen documentation page and README file.