Some additional command-line maturity for 'svnrdump':  Now, explicitly declare and display the available options for each subcommand, and validate what is provided by the user against the same.
Some additional command-line maturity for 'svnrdump':  Now, explicitly
declare and display the available options for each subcommand, and
validate what is provided by the user against the same.

* subversion/svnrdump/svnrdump.c
  (svnrdump_cmd_table): Fix usage lines > 80 characters.  Explicitly name
    the set of accepted options.  (Tweaked the indentation of this for a bit
    more horizontal real estate, too.)
  (main): Keep track of which options were passed to the subcommand, and 
    validate them all against the command table records.

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