: Sync-Flood Fixes

Arnaldo asked me to send these, they have been made independent of the patches in the test tree (but will be made available for review).

Patch #1: Cosmetics, but required by other patches - shortens many occurrences of
very long variable names.

Patch #2: Reset/Sync-Flood Bug fix.
The bug has been known for a long while (I recently found an email from Ian who mentioned it as early as December), a previous discussion with Eddie helped to track down where the bug originates. Patch has detailed description of how bug is triggered, and fixes the described symptom.

Patch #3: Renames parameter for clarity (was confusing).

Patch #4: Rate-Limit DCCP Syncs. This is recommended in RFC 4340 and from own experience
I found that rate-limiting alone can terminate oscillating Sync message exchanges, i.e. it increases resilience against malfunction and attacks.

Patch #5: Second bug - in REQUEST state, a Reset is sent in response to Sync, not SyncAck.