Drop packet if there are not enough free buffers to perform fragmentation
Improve csma debug traces
Add per neighbor packet throttle
sky: Initialize energest as early as possible

If energest is initialized too late, the radio is not accounted
until the first switch. This is a problem when the radio is always
listening.
Support running multiple random seeds in case one fails
Only fail on real fails
Merge pull request #810 from cmorty/pull/sky_energest

sky: Initialize energest as early as possible / make regression testing more tolerant
Fixes warnings, bad code and code style
Use the Z1 product ID as MAC/Node ID if no value is found in the XMEM
Merge pull request #824 from alignan/fix_warnings

Warning fixes
Merge pull request #820 from alignan/serialnum_as_nodeid

Use the Z1 product ID as MAC/Node ID if no value is found in XMEM
Add function to change I2C baudrate and push relevant configuration values to platform config
Merge pull request #825 from alignan/i2c_changes

Add function to change I2C baudrate and push relevant configuration valu...
Merge pull request #648 from cetic/pr-csma-fixes

High throughput fixes for csma and sixlowpan