Merge pull request #49 from mikesperber/include-util-on-darwio

Don't not include util.h if libutil.h is available.

Merge pull request #44 from mikesperber/patch-2

Use https for github submodule URL

Revert "Add missing use of DESTDIR in Makefile.in (thanks to Santiago Pelufo)."

Add COPYING notice.

Add missing use of DESTDIR in Makefile.in (thanks to Santiago Pelufo).

Don't set the write port to nonblocking mode in scheme_pipe.

Merge pull request #28 from scheme/docs

Add write+append+create to scsh-fdports-interface. Fixes #27.

Add subsections to the Filesystem section in System Calls.

Add beginning of process section in docs.

Add docs for temp file creation procedures.

Add the fluids package to scsh-user.

Correct indentation and typos for open-output-file doc.