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Fix compilation error as reported by Nikola in http://lists.freediameter.net/pipermail/help/2014-September/000860.html

Fix a typo in a variable name while here.

by increasing their score by one.

Otherwise, replies can't get out, defeating the purpose of
CLOSING_GRACE.

Added a basic Gx implementation in contrib (untested) -- reported working but may need some adaptation

This is a speedup if many of these exist (compared to checking a
linked list for matches as before).

Refactor a bit while here.

Use the uthash code from Troy D. Hanson,
http://troydhanson.github.com/uthash/

Attempt fix for Failed-AVP created with a Grouped AVP, in that case we want an empty AVP by default, not a blank AVP of the same length

Attempt to produce a CEA that is compliant with the ABNF when the Error bit is not set. Thanks Antonio Martinez for the report -- http://lists.freediameter.net/pipermail/dev/2013-December/000263.html