tests: integrate test-hardlinks-safety.t into test-hardlinks.t

Should make running the testsuite a bit faster.

Also, test-hardlinks.t and test-hardlinks-safety.t now have enough
infrastructure in common.

tests/test-hardlinks.t

@@ -230,3 +230,102 b' Update back to revision 11 in r4 should '
   2 r4/d1/f2
   1 r4/f1
 
+
+Test hardlinking outside hg:
+
+  $ mkdir x
+  $ echo foo > x/a
+
+  $ linkcp x y
+  $ echo bar >> y/a
+
+No diff if hardlink:
+
+  $ diff x/a y/a
+
+Test mq hardlinking:
+
+  $ echo "[extensions]" >> $HGRCPATH
+  $ echo "mq=" >> $HGRCPATH
+
+  $ hg init a
+  $ cd a
+
+  $ hg qimport -n foo - << EOF
+  > # HG changeset patch
+  > # Date 1 0
+  > diff -r 2588a8b53d66 a
+  > --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+  > +++ b/a	Wed Jul 23 15:54:29 2008 +0200
+  > @@ -0,0 +1,1 @@
+  > +a
+  > EOF
+  adding foo to series file
+
+  $ hg qpush
+  applying foo
+  now at: foo
+
+  $ cd ..
+  $ linkcp a b
+  $ cd b
+
+  $ hg qimport -n bar - << EOF
+  > # HG changeset patch
+  > # Date 2 0
+  > diff -r 2588a8b53d66 a
+  > --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+  > +++ b/b	Wed Jul 23 15:54:29 2008 +0200
+  > @@ -0,0 +1,1 @@
+  > +b
+  > EOF
+  adding bar to series file
+
+  $ hg qpush
+  applying bar
+  now at: bar
+
+  $ cat .hg/patches/status
+  430ed4828a74fa4047bc816a25500f7472ab4bfe:foo
+  4e7abb4840c46a910f6d7b4d3c3fc7e5209e684c:bar
+
+  $ cat .hg/patches/series
+  foo
+  bar
+
+  $ cat ../a/.hg/patches/status
+  430ed4828a74fa4047bc816a25500f7472ab4bfe:foo
+
+  $ cat ../a/.hg/patches/series
+  foo
+
+Test tags hardlinking:
+
+  $ hg qdel -r qbase:qtip
+  patch foo finalized without changeset message
+  patch bar finalized without changeset message
+
+  $ hg tag -l lfoo
+  $ hg tag foo
+
+  $ cd ..
+  $ linkcp b c
+  $ cd c
+
+  $ hg tag -l -r 0 lbar
+  $ hg tag -r 0 bar
+
+  $ cat .hgtags
+  4e7abb4840c46a910f6d7b4d3c3fc7e5209e684c foo
+  430ed4828a74fa4047bc816a25500f7472ab4bfe bar
+
+  $ cat .hg/localtags
+  4e7abb4840c46a910f6d7b4d3c3fc7e5209e684c lfoo
+  430ed4828a74fa4047bc816a25500f7472ab4bfe lbar
+
+  $ cat ../b/.hgtags
+  4e7abb4840c46a910f6d7b4d3c3fc7e5209e684c foo
+
+  $ cat ../b/.hg/localtags
+  4e7abb4840c46a910f6d7b4d3c3fc7e5209e684c lfoo
+