Log Message:
devel/guile*-slib: Finish alignment of guile*-slib packages

guile-slib:

Add more comments explaining a residual problem.  Put back RM
statements because they help re-running failed builds, even if they
are pointless on a fresh build.  Sort PLIST.  No change in generated
package.

guile22-slib:

Use variables more.  Move to site/2.2 subdir, following guile-lib and
upstream defaults.  Point to guile-slib for comments.

Sorry for the churn; this was much harder to understand than I expected.