Change "revert" terminology to "rollback" throughout to differentiate between Subversion's 'revert' subcommand and a subtractive 'merge'.
Change "revert" terminology to "rollback" throughout to differentiate
between Subversion's 'revert' subcommand and a subtractive 'merge'.

* subversion/libsvn_client/merge.c
  Rename is_revert variables to is_rollback throughout.
  (enum merge_type): Rename merge_type_revert to merge_type_rollback,
   and adjust indentation level accordingly.

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