[PATCH] Add support for "signal" message channel request

Hello everyone,

The patch implements the following part of SSH RFC:
===CUT===
      byte SSH_MSG_CHANNEL_REQUEST
      uint32 recipient channel
      string "signal"
      boolean FALSE
      string signal name (without the "SIG" prefix)
===END===

I've also extended "_libssh2_error" with an ability to use formatting
string as "_libssh2_debug" does.

Thank you!

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