pager: remove quiet flag
With the pager running as a child process, exiting the pager doesn't
result in a broken pipe message. To distinguish the exit broken pipe code
from a mercurial abort we register the default action for SIGPIPE. This
results in a 141 exit code instead of a 255. On windows SIGPIPE doesn't
exists and a ValueError will be thrown.
test that 'hg commit' does not crash if the user removes a newly added file
$ hg init
$ echo This is file a1 > a
$ hg add a
$ hg commit -m "commit #0"
$ touch b
$ hg add b
$ rm b
$ hg commit -A -m"comment #1"
removing b
nothing changed
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