Documentation and code cleanup changes only.

* subversion/bindings/swig/perl/native/Client.pm
  Code: Sort the list @_all_fns.
  POD: 
  - Move =item for "info" into correct spot wrt sorting.
  - Add section "ADDITIONAL METHODS" listing all methods wrapped,
    but not (yet) documented.
  - Use modern sub parameter conventions in POD (no more "shift"ing).
  - s/$ctx/$client/ which is a more appropriate name for a SVN::Client object.
  - s/$cinfo/$commit_info/, s/$citem/$commit_item/ 
    The days of letter shortage are over. 


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1488693 13f79535-47bb-0310-9956-ffa450edef68