Add line numbers to warning/error messages (and pretty up some existing ones).

(closes issue #11894)
Reported by: jmls
Patches:
      chan_zap.patch uploaded by jmls (license 141)


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@102297 65c4cc65-6c06-0410-ace0-fbb531ad65f3