Remove obsolete multi-db code.
Remove obsolete multi-db code.

* subversion/libsvn_wc/adm_ops.c.c
  (process_committed_leaf, svn_wc__process_committed_internal, svn_wc_delete4,
   revert_entry, revert_internal): Remove conditional multi-db code.
  (erase_from_wc): Remove.
  (svn_wc_add4): Remove unneeded variables, remove conditional multi-db code.

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