tests/test-remove

remove: rewrite to be ~400x faster, bit more friendly

old remove code called localrepo.changes for each file.
was very expensive:

  $ hg --time rm arch>/dev/null
  Time: real 1066.120 secs (user 1014.450+0.000 sys 18.090+0.000)

new code, same files:

  $ hg --time rm arch>/dev/null
  Time: real 2.770 secs (user 2.190+0.000 sys 0.580+0.000)

also mention "-f" if not removing files. also allow "-f" to forget
added files.

make test a bit better.

#!/bin/sh

hg init a
cd a
echo a > foo
hg rm foo
hg add foo
hg commit -m 1 -d "1000000 0"
hg remove
rm foo
hg remove foo
hg revert
rm foo
hg remove --after
hg commit -m 2 -d "1000000 0"
hg export 0
hg export 1
hg log -p -r 0
hg log -p -r 1

echo a > a
hg add a
hg rm a
hg rm -f a
echo b > b
hg ci -A -m 3 -d "1000001 0"
echo c >> b
hg rm b
hg rm -f b

cd ..
hg clone a b