* export_ies uses now _VAR else the vars are not copied to the dest chan

* export_ies uses now _VAR else the vars are not copied to the dest chan
* when receiving a connect from the NT Side we wait until we have the final
  l3id until we queue the answer to asterisk to avoid bridging conflicts
* when not bridged to misdn we had a segfault after receiving the connect
  due to a strcasecmp bug.. this didn't happen before, cause we hadn't had
  the bridge before
* cleanup of the bchannels is queued now, due to possible race conditions
* added mISDN_clear_stack when cleaning the bchannel

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@29667 65c4cc65-6c06-0410-ace0-fbb531ad65f3