Because so much of the svnsync subcommand setup is identical across all the subcommands, move to a common shared subcommand baton structure across all subcommands.
Because so much of the svnsync subcommand setup is identical across
all the subcommands, move to a common shared subcommand baton
structure across all subcommands.

* subversion/svnsync/main.c
  (init_baton_t, sync_baton_t, copy_revprops_baton_t): Replaced by ...
  (subcommand_baton_t): ... a new common baton ...
  (make_subcommand_baton): ... and a factory function to make it.
  (initialize_cmd, synchronize_cmd, copy_revprops_cmd): Use
    make_subcommand_baton().
  (): Throughout, update references to the old batons with
    subcommand_baton_t, and fix changes in levels of pointer
    referencing.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@866544 13f79535-47bb-0310-9956-ffa450edef68

wbond/subversion,wbond/subversion,wbond/subversion,wbond/subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,YueLinHo/Subversion