[m-rev.] for post-commit review: minor cleanups of code related to library installs

[Zoltan Somogyi]

For review by anyone.

My planned next two steps are

- moving the part of make.program_target.m that deals with
  library installs to a new module, named make.install_library
  (unless someone can propose a better name),

- adding a module comment to the new module that describes
  what files are put into what directories by the moved code.

The latter is needed because (a) the rules for what files are put where
seem to be different for *installed* libraries than for the workspaces
that the libraries are installed *from*, which is itself probably a mistake,
and (b) the rules for installed libraries do not seems to be documented
anywhere (yet). I think I need that documentation before I can fix
the code installing .module_dep files *properly*.

Zoltan.
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