uhd: work on moving binaries to lib/uhd
uhd: added args member to tune_request object
usrp: poke tune args into dboards that support it
Merge branch 'fhs_work'
Merge branch 'next'
uhd: increment UHD_VERSION_ABI_STRING "3.6.0-0"

Added tune args to tune request.
Thefore the API of the master branch does not match 3.5.* release,
by this system, the compat string should be the unrelease 3.6 - w/ compat -0.
The -0 may increase w/ future ABI/API changes before 3.6 release.