scripts: environment: Build environments as profiles.

Fixes <http://bugs.gnu.org/19816>.

* guix/scripts/environment.scm (evaluate-input-search-paths)
(build-inputs): Delete.
(evaluate-profile-search-paths, strip-input-name)
(package-or-package+output?, package-environment-inputs)
(build-environment, inputs->profile-derivations): New procedures.
(create-environment, show-search-paths, launch-environment)
(launch-environment/container): Replace 'inputs' argument
with 'profile' argument.
(package+propagated-inputs): Strip off names off of input tuples.
(options/resolve-packages): Handle input tuples that specify an output
in expressions.
(guix-environment): Convert inputs into a profile to use in the
environment.  Remove non-package inputs such as origins from
environment inputs.
* doc/guix.texi ("invoking guix environment"): Document package+output
tuples for --expression option.
* tests/guix-environment.sh: Update tests.
* tests/guix-environment-container.sh: Likewise.

Co-authored-by: Ludovic Courtès <ludo@gnu.org>

tests/guix-environment-container.sh

@@ -73,7 +73,7 @@ guix environment --container --ad-hoc --bootstrap guile-bootstrap \
      -- guile -c "$mount_test_code" > $tmpdir/mounts
 
 cat "$tmpdir/mounts"
-test `wc -l < $tmpdir/mounts` -eq 3
+test `wc -l < $tmpdir/mounts` -eq 4
 
 current_dir="`cd $PWD; pwd -P`"
 grep -e "$current_dir$" $tmpdir/mounts # current directory