fix race in codec failure condition, then fix bug in sdp parsing (likely a regression from recent codec changes) to never have the problem in the first place so you are double-protected

skypopen: manage ERROR 36 Not online, cosmetics, put the interface DOWN when no session and when beginning to destroy

add fwd and rev message scroll keys as default and return to same message when doing a message forward

add fwd and rev message scroll keys as default and return to same message when doing a message forward

- New struct for matchs
- On calls originated from an FXS branch, the Endpoint searches for a valid extension (digits sent) after the DTMF '#' or after the timeout (option fxs-digit-timeout). That search is done in the context defined in section <fxs-options>, or if no context configured, the search is done in context defined in context-fxs.
- Added "dialplan" configuration: Name of the dialplan module in use
(default XML)
- Group context enabled. If set, the search for a valid extension is done only in that context.
- Updated documentation