copyright header format and dates
code formatting and guidelines conformance
use of timeval wrapper functions
use of memory allocation wrappers
propery unref created interface objects during config load
document new variable set by chan_zap in doc/channelvariables.txt
remove useless 'extern' on function prototypes and definitions


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@9451 65c4cc65-6c06-0410-ace0-fbb531ad65f3