tests/test-extra-filelog-entry.t

test-transplant.t: improve test coverage

* ?, x, q
* not a parent
* --source
* outstanding local changes
* outstanding uncommitted merges
* no revision checked out
* checkopts all+branch+rev
* checkopts all-branch
* checkopts no-args
* checkopts continue+all
* revset:transplanted(...)
* filter corrupted changeset

Issue351: mq: qrefresh can create extra revlog entry

  $ echo "[extensions]" >> $HGRCPATH
  $ echo "mq=" >> $HGRCPATH

  $ hg init
  $ hg qinit

  $ echo b > b
  $ hg ci -A -m foo
  adding b

  $ echo cc > b
  $ hg qnew -f foo.diff
  $ echo b > b
  $ hg qrefresh

  $ hg debugindex b
     rev    offset  length  ..... linkrev nodeid       p1           p2 (re)
       0         0       3  .....       0 1e88685f5dde 000000000000 000000000000 (re)