Document the convention of starting each log message with a summary line.
Document the convention of starting each log message with a summary line.

* HACKING
  (Writing log messages): Describe the convention, explain about CIA.

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion