debian:
* fixed erroneous man pages
  (due to missing 'librtlsdr' dependency when running 'help2man')
* added 'librtlsdr' dependency for 'librtlsdr-dev' package
* added man page for 'rtl_power' binary
Merge Debian packaging fixes from branch 'debian'
RELEASE (0.5.2~git20131227~quantal1)
> https://launchpad.net/~cedric.dufour/+archive/ppa