Allow manager originate and spool files to set writable dialplan functions,
including those that use the pipe symbol to seperate arguments.
Allow CDR dialplan function to be able to set the account code and userfield.
This deprecates the use of the Account header in manager originate and spool
files, as well as the SetAccount and SetCDRUserField applications.


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@6147 65c4cc65-6c06-0410-ace0-fbb531ad65f3