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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adding foo

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adding bomb

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adding a.c

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adding dir/a.o

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adding dir/b.o

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R a.c

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R dir/a.o

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R dir/b.o

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? .hgignore

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a.c: unsupported file type (type is fifo)

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R a.c