This is a "fix" for something that's been bugging the crap out of me for a while.

The variable name "flag" to distinguish between whether a message is being forwarded or
is new is not a helpful name. The newly added doxygen documentation to app_voicemail is
tremendously helpful, but I still just...hate this variable name. I think is_new_message
is more indicative of what its purpose is.



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@113207 65c4cc65-6c06-0410-ace0-fbb531ad65f3