doc: Mention 'guix environment' in "Features"; add index entries.
* doc/guix.texi (Features): Add paragraph about 'guix environment'. (Build Systems): Add @cindex. (Invoking guix environment): Ditto.
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			@ -694,6 +694,12 @@ downloads it and unpacks it;
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otherwise, it builds the package from source, locally
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(@pxref{Substitutes}).
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Control over the build environment is a feature that is also useful for
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developers.  The @command{guix environment} command allows developers of
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a package to quickly set up the right development environment for their
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package, without having to manually install the package's dependencies
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in their profile (@pxref{Invoking guix environment}).
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@node Invoking guix package
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@section Invoking @command{guix package}
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			@ -1576,6 +1582,7 @@ Build systems are @code{<build-system>} objects.  The interface to
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create and manipulate them is provided by the @code{(guix build-system)}
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module, and actual build systems are exported by specific modules.
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@cindex bag (low-level package representation)
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Under the hood, build systems first compile package objects to
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@dfn{bags}.  A @dfn{bag} is like a package, but with less
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ornamentation---in other words, a bag is a lower-level representation of
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			@ -2894,6 +2901,7 @@ and exit.
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@node Invoking guix environment
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@section Invoking @command{guix environment}
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@cindex reproducible build environments
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The purpose of @command{guix environment} is to assist hackers in
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creating reproducible development environments without polluting their
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package profile.  The @command{guix environment} tool takes one or more
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