add prechangegroup and pretxnchangegroup hooks. prechangegroup lets you stop push, pull or unbundle before it begins. pretxnchangegroup lets you inspect changegroup before transaction is committed, and roll back if you not like it.

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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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! a.c

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! dir/a.o

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! dir/b.o

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? .hgignore

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

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! a.c