tests/test-merge-symlinks.hg

help: refer to user configuration file more consistently

Currently, a number of commands and help topics mention the user hgrc
file in different ways. Among these are following:

1. .hgrc - "please specify your commit editor/username in your .hgrc
file", bookmarks, color, hgk, pager, hg help environment

2. $HOME/.hgrc - hg help paths, hgrc(5), hg(1)

3. ~/.hgrc - hgrc(5)

In addition to being inconsistent, none of these make sense on
Windows. This patch replaces the above with a more general term of
"[your] configuration file".

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