bundle2: add some distinction between mandatory and advisory part
Mandatory part cannot be ignored when unknown. We raise a simple KeyError
exception when this happen.
This is very early version of this logic, see inline comment for future
improvement lead.
Mercurial
=========
Mercurial is a fast, easy to use, distributed revision control tool
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$ make # see install targets
$ make install # do a system-wide install
$ hg debuginstall # sanity-check setup
$ hg # see help
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