uhd: re-wrote uhd_images_downloader (OO, new options, hopefully much more robust and user-friendly)
usrp_n2xx_simple_net_burner: ~ now expands into user's home directory
Squashed commit uhd/cleanup.
Squashed merge of Coverity fixes.
Merge remote-tracking branch 'origin/uhd/new_images_downloader'
Merge Corgan's branch 'origin/n2xx/net_burner_path_fix'
UHDPackage: fix references to README and LICENSE files after name changes
cmake: fixed installation of README and LICENSE files after filename changes
cmake: remove Git hash from version string when 'rc' is present