obslog: use singular name "succnode" for each element of {succnodes}
The name that we pass for formatlist() is the name of each
element. After this patch, you'll write '{succnodes % "{succnode}"}'
instead of the confusing '{succnodes % "{succnodes}"}' (where the two
"succnodes" refer to different things.
Users can write templates that are compatible across this change by
using e.g. '{succnodes % "{if(succnode, succnode, succnodes)}"}'.
Test that share-clones use the cache in the original repository.
$ . $TESTDIR/testlib/common.sh
$ hg init share-base
$ cd share-base/
$ cat >> .hg/hgrc <<EOF
> [extensions]
> evolve=
> share=
> EOF
$ hg debugbuilddag .+3:branchpoint+4*branchpoint+2
$ cd ..
$ hg --config extensions.share= share -U share-base share-client
$ cd share-client
$ hg debugupdatecache
$ test -d .hg/cache
[1]
$ test -d ../share-base/.hg/cache