Note that argcomplete is also now required.

This is a pretty big simplification: the user should first use pip to
install everything in `requirements.txt`, and we no longer try to
cater to cases where Cython is missing, etc.

This was in setup.py to reduce litter in the root directory, but it's
simpler to keep it how it's supposed to be.

Still allow installation without it, though.

Otherwise we might inadvertently catch SystemExit or KeyboardExit or
something we don't want to catch.

Currently, only append_list is written (and hardly tested)

Update tests accordingly.  This isn't backwards compatible, but
existing clients don't rely on it.

Now we build Cython modules only if cython >= 0.16 is present.
Tarballs made by "make sdist" include the Cython-generated *.c files,
and so Cython isn't required on the end user machine at all.

At install time, the script "/usr/bin/nilmtool" will be created.

datetime_tz isn't readily available, so it's a lot easier to just
package it within the nilmdb tree.

Adjusted setup.cfg so "python setup.py nosetests" now works correctly.
Also added a "test" alias so that "python setup.py test" works.

git-svn-id: https://bucket.mit.edu/svn/nilm/nilmdb@9272 ddd99763-3ecb-0310-9145-efcb8ce7c51f

git-svn-id: https://bucket.mit.edu/svn/nilm/nilmdb@9269 ddd99763-3ecb-0310-9145-efcb8ce7c51f

git-svn-id: https://bucket.mit.edu/svn/nilm/nilmdb@9267 ddd99763-3ecb-0310-9145-efcb8ce7c51f