guix package: Add 'install', 'remove', and 'upgrade' aliases.

* guix/scripts/install.scm, guix/scripts/remove.scm,
guix/scripts/upgrade.scm, tests/guix-package-aliases.sh: New files.
* Makefile.am (MODULES, SH_TESTS): Add them.
* po/guix/POTFILES.in: Add them.
* guix/scripts/package.scm (guix-package): Split with...
(guix-package*): ... this.  New procedure.
* doc/guix.texi (Invoking guix package): Document them.
(Binary Installation, Application Setup, Package Management)
(Packages with Multiple Outputs, Package Modules)
(X.509 Certificates, Installing Debugging Files): Use 'guix install' in
simple examples.
* etc/completion/bash/guix (_guix_complete): Handle "install", "remove",
and "upgrade".

tests/guix-package-aliases.sh

@@ -0,0 +1,58 @@
+# GNU Guix --- Functional package management for GNU
+# Copyright © 2019 Ludovic Courtès <ludo@gnu.org>
+#
+# This file is part of GNU Guix.
+#
+# GNU Guix is free software; you can redistribute it and/or modify it
+# under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or (at
+# your option) any later version.
+#
+# GNU Guix is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
+
+#
+# Test the `guix package' aliases.
+#
+
+guix install --version
+
+readlink_base ()
+{
+    basename `readlink "$1"`
+}
+
+profile="t-profile-$$"
+rm -f "$profile"
+
+trap 'rm -f "$profile" "$profile-"[0-9]*' EXIT
+
+guix install --bootstrap guile-bootstrap -p "$profile"
+test -x "$profile/bin/guile"
+
+# Make sure '-r' isn't passed as-is to 'guix package'.
+if guix install -r guile-bootstrap -p "$profile" --bootstrap
+then false; else true; fi
+test -x "$profile/bin/guile"
+
+guix upgrade --version
+guix upgrade -n
+guix upgrade gui.e -n
+if guix upgrade foo bar -n;
+then false; else true; fi
+
+guix remove --version
+guix remove --bootstrap guile-bootstrap -p "$profile"
+! test -x "$profile/bin/guile"
+test `guix package -p "$profile" -I | wc -l` -eq 0
+
+if guix remove -p "$profile" this-is-not-installed --bootstrap
+then false; else true; fi
+
+if guix remove -i guile-bootstrap -p "$profile" --bootstrap
+then false; else true; fi