Clarify some pool usage in the delta editor. Some are result pools, and many are scratch pools.
Clarify some pool usage in the delta editor. Some are result pools, and
many are scratch pools.

Note: I reviewed a bunch of implementations of the delta editor, and these
distinctions seem appropriate based on precedent.

* subversion/include/svn_delta.h:
  (svn_delta_editor_t): clarify pools' purpose and rename accordingly.

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