tests/test-merge8.t

contrib: check reference to old selenic.com domain

Now, all URL in Mercurial source tree should refer mercurial-scm.org
domain instead of selenic.com.

*.po files are ignored in this patch, because they might contain
msgid/msgstr coming from old source files.

This ignorance seems safe enough, because such msgstr should be
ignored at runtime, because:

  - msgid corresponded to it should be invalid, or
  - msgstr itself should be marked as fuzzy at synchronized to recent hg.pot

If any additional examination for *.po files is needed in the future,
let i18n/check-translation.py achieve such examination.

BTW, some binary files (e.g. *.png) are meaningless for checking
reference to old domain in this patch, but aren't ignored like as *.po
files, because excluding multiple suffixes is difficult for regexp
matching.

Test for changeset ba7c74081861
(update dirstate correctly for non-branchmerge updates)
  $ hg init a
  $ cd a
  $ echo a > a
  $ hg add a
  $ hg commit -m a
  $ cd ..
  $ hg clone a b
  updating to branch default
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ cd a
  $ hg mv a b
  $ hg commit -m move
  $ echo b >> b
  $ hg commit -m b
  $ cd ../b
  $ hg pull ../a
  pulling from ../a
  searching for changes
  adding changesets
  adding manifests
  adding file changes
  added 2 changesets with 2 changes to 1 files
  (run 'hg update' to get a working copy)
  $ hg update
  1 files updated, 0 files merged, 1 files removed, 0 files unresolved

  $ cd ..