Removed repl command
open and init now start up the repl if used in single-command mode.
Changed names of the document nav commands to be easier to remember.
Changed "selectors" unit to "getters", since there may be a "setters" unit that would need the 's'
fixed a bug in next, previous commands which required a filter to work around.
Name changes to some config commands, including new "category" and "status" commands.
Changed names (in documentation, since they're not implemented) of tags commands to match new easy to remember standard.
More renaming of commands.
"get" command now accepts getters, just like list, instead of just property names.
Yet more command renames.
Finished renaming everything.