Move cause 200 to cause 26, as specified in Q.850.

Also cleanup the formatting and add a few more that seem like good candidates.

(closes issue #16157)
 Reported by: wimpy


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@262513 65c4cc65-6c06-0410-ace0-fbb531ad65f3