libbladeRF: API change for get/set data transfer timeout

Addresses issue #202.

Fixed name and made return value an operation status rather than
returned value for consistency. We may need to make some
backend-specific calls here in the future, hence this interface
returning status.

The current implementation is not backend-specific, and has been moved
up to the top-level.
libbladeRF: Refactored correction functions and enumeration.
bladeRF-cli: Cleaned up correct command

Added return value and parameter checks. This command now ensures that the FPGA
is loaded. Performed misc. cleanup.
host: Fixed sample format misnomer - Q12 -> Q11

The sample format was incorrectly named, as there are only 11 fraction
bits, not 12.

The enumeration value has been renamed, and a macro definition is
provided for reverse compatibility. (This macro def will be removed
prior to the first "release.")
bladeRF-cli: Correct rx/tx error messages for invalid config params

Fixes issue #204
bladeRF-cli: Moving over to use rational rates for sample rates.
libbladeRF: Updated description of bladerf_log_set_verbosity
hdl: Changed constraints and signaling, fixed SPI/UART contention

The FPGA, when in SPI flash access mode, has the UART disappear. It should not be
driving the UART signal or the CTS signal. When the SYS_RST is asserted, drive those pins to 'Z'.
libbladeRF, bladeRF-cli: Switch naming convention to BLADERF_CORR_<DEVICE>_<REG>
hdl: Modify phase range for IQ correction.

Modified the phase range of the FPGA IQ corretion to be +/-10 degrees instead of +/-45 degrees.
libbladeRF: Documented correction parameter values
libbladeRF: Rearranged and cleaned up header, removed unimplemented bladerf_stats

Definitions and typedefs in the libbladeRF.h header have been moved to
their appropriate groups so that they show up in the relevant module in
Doxygen output.

The bladerf_stats structure and associated function have been removed,
as this functionality is not schedule for implementation in the near
future. This will be re-added when this functionality becomes available.

The bladerf_set_loopback() function has been marked unimplemented as it
currently does not function as desired, but is schedule to be
implemented.
libbladeRF: Always start the device in USB_IF_NULL when opening

This is redundant and likely unnecessary -- more of a "just in case"
libbladeRF: Cleaned up debug/verbose log info
hdl: Version bump to 0.0.2

Updating patch to denote fixes to:
 - Phase range for I/Q correction
 - Fixed constraints
 - SPI/UART signal contention fix
libbladeRF: Bumping minor rev to 0.12.0 to denote API changes

Minor rev is used to denote API changes until we reach a stable 1.0.0.

This increment is used to denote:
 - Renamed functions and enumerations
 - Changes to the correction interface
 - Updated documentation
bladeRF-cli: Bumped patch version to denote fixes (0.10.2)

Fixes include:
 - Supporting rational sample rates via the libbladeRF rational sample
   rate i/f
 - Fixes in the 'correct' command, pertaining to the libbladeRF 0.12.0
   changes.
 - RX/TX command error message fixes
libbladeRF: Normalize the DC offset set/get functions to +/- 2048, update comments to reflect this.
libbladeRF: Add in additional error checking on correction ranges.  Do scaling for RX and TX independently.
libbladeRF: Format all comments with /* */, fix capitalization.