Add a big table describing the "presence" column values in wc-ng.
Add a big table describing the "presence" column values in wc-ng.

* notes/wc-ng-design: describe the presence state combinations

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