tests/test-execute-bit

color: colorize based on output labels instead of parsing output

By overriding ui.write(), ui.write_err(), ui.popbuffer(), and ui.label(),
the color extension can avoid parsing command output and simply colorize
output based on labels.

As before, the color extension provides a list of default colors for
core commands/labels. Other extensions can provide their own defaults by
specifying a colortable dict (similar to cmdtable).

In this process, --color is promoted to a global option and the deprecated
--no-color option is removed.

#!/bin/sh

"$TESTDIR/hghave" execbit || exit 80

hg init
echo a > a
hg ci -Am'not executable'

chmod +x a
hg ci -m'executable'
hg id

echo '% make sure we notice the change of mode if the cached size == -1'
hg rm a
hg revert -r 0 a
hg debugstate
hg st

hg up 0
hg id
test -x a && echo executable -- eek || echo not executable -- whew