firmware: rffc frac, if gain
lib: if freq
fw: ack
firmware: if precision
firmware: automagically update freq when changing the if freq
fw: dc offset correction fix

pins b7 & b6 are floating, disable re-triggering
selecting a different HPC_STOP fixes the dc offset drift
disabling and enabling rx/tx after tuning triggers the dc offset
correction
firmware, lib: update comments, doc
Fixing typo in usage text
Include udev rule if -DINSTALL_UDEV_RULES=ON is set (copied from rtl-sdr)
Include udev rule if -DINSTALL_UDEV_RULES=ON is set (copied from rtl-sdr)
Merge pull request #79 from Hoernchen/master

This is excellent, especially the DC offset fix.
Merge pull request #81 from ibobbitt/master

Typo in hackrf_transfer usage text
Merge pull request #82 from ibobbitt/upstream

Include udev rule if -DINSTALL_UDEV_RULES=ON is set (copied from rtl-sdr...
trying to fix "0.000 MHz" output bug that only affects certain people
hackrf_transfer usage() update to warn people about -w
fix permissions on udev rules

when setting a group on a device typically you only set write for root and the group not for world.  should be 660 not 666, 666 is the devil.
Merge pull request #88 from ZeroChaos/patch-1

fix permissions on udev rules
.so and .pc version update
Merge pull request #1 from mossmann/master

pull