Merge pull request #6 from fingon/bugfix

Fixed a race condition with signals
Update README to reflect RA-features
Update license headers
Initial support for RFC 6603
Add reconfigure authentication
Fix compilation
Fix CFLAGS and README
Fix authentication option format
Set SOL_MAX_RT to 7200 according to RFC 6204 bis
Several bugfixes
Set default SOL_MAX_RT to 1h
Update README
Update README again
Set a global default DHCPv6 exchange timeout

This delays SLAAC-updates before any DHCPv6-binding is established.
Readjust call-delay to be more backward-compatible
Update README
Use key=val pairs for additional prefix params
Add support for DS-Lite AFTR
Fix possible buffer overflows in DNS handling
Export AFTR-IP as well and update README