Merge branch 'lt/rename' into HEAD

* lt/rename:
Do the fuzzy rename detection limits with the exact renames removed
Fix ugly magic special case in exact rename detection
Do exact rename detection regardless of rename limits
Do linear-time/space rename logic for exact renames
copy vs rename detection: avoid unnecessary O(n*m) loops
Ref-count the filespecs used by diffcore
Split out "exact content match" phase of rename detection
Add 'diffcore.h' to LIB_H

diff --combined Makefile
index eb98d91bdf14b261fd62d2094c9e52f153e042d9,2e6fd8f21950c1acf50f8d50158c93b53ca70c23..71479a2a64249c2bf3f015852f1aa9aa9392d509
--- 1/Makefile
--- 2/Makefile
+++ b/Makefile
@@@ -225,7 -225,8 +225,7 @@@ SCRIPT_SH = 
  SCRIPT_PERL = \
        git-add--interactive.perl \
        git-archimport.perl git-cvsimport.perl git-relink.perl \
 -      git-cvsserver.perl git-remote.perl \
 -      git-svnimport.perl git-cvsexportcommit.perl \
 +      git-cvsserver.perl git-remote.perl git-cvsexportcommit.perl \
        git-send-email.perl git-svn.perl
  
  SCRIPTS = $(patsubst %.sh,%,$(SCRIPT_SH)) \
@@@ -289,7 -290,7 +289,7 @@@ LIB_H = 
        run-command.h strbuf.h tag.h tree.h git-compat-util.h revision.h \
        tree-walk.h log-tree.h dir.h path-list.h unpack-trees.h builtin.h \
        utf8.h reflog-walk.h patch-ids.h attr.h decorate.h progress.h \
-       mailmap.h remote.h transport.h
+       mailmap.h remote.h transport.h diffcore.h hash.h
  
  DIFF_OBJS = \
        diff.o diff-lib.o diffcore-break.o diffcore-order.o \
@@@ -299,7 -300,7 +299,7 @@@
  LIB_OBJS = \
        blob.o commit.o connect.o csum-file.o cache-tree.o base85.o \
        date.o diff-delta.o entry.o exec_cmd.o ident.o \
-       interpolate.o \
+       interpolate.o hash.o \
        lockfile.o \
        patch-ids.o \
        object.o pack-check.o pack-write.o patch-delta.o path.o pkt-line.o \
@@@ -916,7 -917,6 +916,6 @@@ git-http-push$X: revision.o http.o http
  
  $(LIB_OBJS) $(BUILTIN_OBJS): $(LIB_H)
  $(patsubst git-%$X,%.o,$(PROGRAMS)): $(LIB_H) $(wildcard */*.h)
- $(DIFF_OBJS): diffcore.h
  
  $(LIB_FILE): $(LIB_OBJS)
        $(QUIET_AR)$(RM) $@ && $(AR) rcs $@ $(LIB_OBJS)