tests/test-extra-filelog-entry.t

manifest.c: ensure realloc_if_full() returns 1 or 0

This fixes an MSVC 2008 warning that I don't see with gcc 4.6.3-2:

    warning C4047: 'return' :
            'bool' differs in levels of indirection from 'line *'

More importantly, the truncation from pointer to 'unsigned char' would have
returned 0 if self->lines pointed to an address divisible by 0xFF, which causes
find_lines() to return MANIFEST_OOM.  I was able to cause this to happen in a
trivial program with the gcc compiler.

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)