[PATCH] Heratbeat support implemented during GSoC

[Olya]

Hello.

Attached are the patches resulted from my GSoC project this summer. And few small
corrections discovered afterwards :)

Those patches add rfc 6520 (heartbeat) extension support. They were tested against
openssl for compatibility. However no "real world" testing was done e. g. no
dedicated programs, just slight modification of existing echo client\server. So
testing, corrections, suggestions are more than welcomed.

Please review and merge if possible.
-- 
best regards,
Olga.
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