Fix hg push and hg push -r sometimes creating new heads without --force. Fixing issue179. The algorithm checks if there not more new heads on the remote side than heads which become non-heads due to getting children. Pushing this repo: m /\ 3 3a| |/ / 2 2a |/ 1 to a repo only having 1, 2 and 3 didn't abort requiring --force before. Added test cases for this and some doc strings for used methods.

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#!/bin/sh

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hg init 1

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echo '[ui]' >> 1/.hg/hgrc

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echo 'timeout = 10' >> 1/.hg/hgrc

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echo foo > 1/foo

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hg --cwd 1 ci -A -m foo

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hg clone 1 2

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hg clone 2 3

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echo '[hooks]' >> 2/.hg/hgrc

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echo 'changegroup.push = hg push -qf ../1' >> 2/.hg/hgrc

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echo bar >> 3/foo

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hg --cwd 3 ci -m bar

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hg --cwd 3 push ../2