Add 'guix size'.

* guix/scripts/size.scm: New file.
* Makefile.am (MODULES): Add it.
  (SCM_TESTS): Add tests/size.scm.
* doc.am (SUBCOMMANDS): Add 'size'.
* po/guix/POTFILES.in: Add guix/scripts/size.scm.
* tests/size.scm: New file.
* doc/guix.texi (Packages with Multiple Outputs): Add xref to "Invoking guix
  size".
  (Invoking guix size): New node.
  (Invoking guix gc): Add index for "closure" and xref to the above.
* doc/contributing.texi (Submitting Patches): Use @enumerate for the check
  list.  Add item about 'guix size'.

1 files changed, 1 insertions, 0 deletions

diff --git a/doc.am b/doc.am
index 1c52066aa0..ee896c189b 100644
--- a/doc.am
+++ b/doc.am
@@ -100,6 +100,7 @@ SUBCOMMANDS :=					\
   publish					\
   pull						\
   refresh					\
+  size						\
   system
 
 $(eval $(foreach subcommand,$(SUBCOMMANDS),			\