Make the conflict resolver send a conflict summary to the caller, beforeinvoking the conflict callback.This will eventually allow 'svn' to print the conflict summary before theinteractive conflict resolution callback is invoked. This summary is currentlyprinted after the callback was invoked on each conflict, which isn't helpful.This commit has no visible behaviour change yet, as this would require alloperations to delay conflict callback invocation, which has currently beenimplemented only for 'update'.* subversion/include/svn_wc.h (svn_wc_notify_action_t): Add svn_wc_notify_conflict_summary action. This currently sends the number of text, property, and tree conflicts in the working copy. We might extend this later, but for now the goal is to move the current 'svn' conflict stats collecting into the conflict resolver. (svn_wc_notify_t): Add text_conflicts, prop_conflicts, and tree_conflicts counters for use during an svn_wc_notify_conflict_summary notification.* subversion/libsvn_wc/conflicts.c (conflict_status_walker_baton): Remove. (conflict_status_walker): Replaced by ... (gather_conflict_stats): ... this function, which only gathers conflict statistics and the list of conflicted paths. (gather_conflict_stats_baton): New baton for above status walker callback. (resolve_conflicts_on_node): New function, contains the guts of the former conflict_status_walker() callback. (svn_wc__resolve_conflicts): Gather conflict stats via the status walker, send a conflict summary via the notification mechanism, and then invoke the interactive conflict callback on each conflicted path found during the status walk.* subversion/svn/notify.c (notify): Handle the new conflict summary notification. For now, this only saves the resolver's conflict stats in the notify baton for later use. In the future, when all operations delay invocation of the conflict callback, we can rid of svn_cl__print_conflict_stats() and print the stats here.