make all commands be repo-wide by default - refactor code in commands.py so that: if no pattern is given, the command will be repo-wide else it will work on the working dir - update the doc - fix the tests

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#!/bin/sh

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hg init

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echo This is file a1 > a

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hg add a

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hg commit -m "commit #0" -d "0 0"

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ls

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echo This is file b1 > b

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hg add b

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hg commit -m "commit #1" -d "0 0"

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hg co 0

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# B should disappear

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ls