UHDPackage: with a libusbx static library being used for installers, remove libusb-1.0 as package dependency
Minor detail fixes to top-level README

* Updated NI-USRP URL to most recent release
* Fixed supported Windows versions
* Minor Mac typo
Merge branch 'uhd/libusbx_prep'
120 MHz daughterboard support, Integer-N tuning, ADF435x code consolidation

* Added support for new CBX-120, SBX-120, and WBX-120 daughterboards
* Added implementation of Integer-N tuning for all CBX, SBX, and WBX daughterboards
* Added --int-n option to examples to show how to use Integer-N tuning API
* Removed duplicate ADF4350/ADF4351 code and moved it to common/adf435x_common.cpp
Merge branch 'uhd/adf435x-work'
Brought in UHD 3.6.2 MacPorts patches for OS X compatibility

* With OS X, boost::lexical_cast won't accept to_hex<boost::uint16_t> as a type
Added check and handling for gain names.
uhd: disabled atomic 'claim' check for multi-threaded access to recv_packet_demuxer_3000
The only caller is from super_packet_recv_handler, which is already not thread-safe.
The only underlying transport (libusb1_zero_copy) is thread-safe, so this shouldn't have an impact.
This solves the issue where (e.g. from GNU Radio), 'interrupt' is called on the worker thread while waiting for a join when worker thread is torn down (e.g. GR top block stop/wait/start),
which would cause the demuxer to still think the transport was claimed, as an interrupted exception will be thrown in 'wait_for_completion' in the transport, and execution will not
continue back into the demuxer to mark the transport as un-claimed, so future 'recv' streamer calls will always fail since the demux thinks the transport is still claimed from before.
uhd: disabled other use of _claimed and cond sync variables (no effect if previous change is used anyway)
uhd: so Coverity doesn't complain, removed variable declarations too
Merge branch 'origin/mwest/gain_name_check'
Merging USRP X300 and X310 support!!
Un-doing firmware change regarding ICMP packate handling.

Reverting "x300: ICMP_DUR handler fixed. Supposedly closes #256."
This reverts commit 69317629f353734d5ac21dc78be105b2f0164497.

Resolved Conflicts:
	firmware/x300/x300/x300_main.c
Pushing the bulk of UHD-3.7.0 code.
Putting the ICMP destination unreachable fix in X300 firmware.
Updated images URL to UHD 3.7.0 images