[inga] replace WITH_UIP6 by new standard define UIP_CONF_IPV6
[inga] set RF230_CONF_RX_BUFFERS to 3
[inga] Fix gyroscope status in inga bootscreen
[inga] contiki-inga-main: Removed support for old RF230 driver
[inga] Major restructuring and cleanup of inga core

All inga-related configuration defines are now prefixed with INGA_CONF_

Address generation and handling is fixed and mainly relies on the EUI64.
Also auto-generation was improved.
The meaning of the node id for simulation and debugging only was emphasized.

All configuration options were documented.
[inga] Removed some unnecessary and outdated uip configs
[inga/regression-tests] Update ipv6 test to use new node_id-configured
EUI64-address scheme without MAC compatiblity and with local bit set.

Results in IPv6 addresses of form 'fe80::id'

For this, contiki-inga-main was modified to set U/L bit to 1
(in case of node_id of random generation) to indicate local EUI64 address.
[inga/regression-tests] Fixed setting linkaddr based on short address

A shortaddr of 0x0001 should result in a link layer address of 0.1

Adapted rime test to send to address 0.1 instead of 1.0
Merge pull request #4 from ejoerns/pull-req/inga-core-fixes

INGA core cleanup and fixes