Merge branch 'maint'
Minor changes for Debian package compliance
cmake: uhd-usrp.rules location fixed to reflect FHS compliance
cmake: Binaries give notification before installing or uninstalling UHD. Better to give an output than just an empty pause.
Changes preinst.in to 'echo' instead of 'ls'
uhd: added missing shbang to pre/post scripts
uhd: added post/pre un/install scripts for deb and rpm packages
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