Add package for aspell and ass't dictionaries (#3890)

* Add package for aspell and ass't dictionaries

Add a package definition for aspell.

Add a handful of dictionaries to convince myself that the support for
a bunch of dictionaries works.

* Flake8 cleanup

* Use six's version of urlparse

`urlparse` is not python3 friendly.  This works around it (stolen from
`.../cmd/md5.py`).

* Fix incorrect trimming regexp

* Clean up dictionary build

- more parsimonious use of `which` (`make()` has already been made)
- use `sh` instead of `bash`

* Use a helper method to generate info for variants

I figured out my issues with static methods.  I *think* that it this
is pythonic.

* Convert aspell to an extendable package

Convert aspell to be extendable and rework the dictionaries to be
extensions.

As it stands, there's a great deal of cut and paste in the
dictionaries, I'll abstract that out next.

The {de,}activate methods copy a great deal of code out of
package.py.  Perhaps there's a better way....

* Create AspellDictPackage and use it for the dictionaries

Reduce the repeated code, pull it into a base class.

I'm confused about why 'from spack import *' wasn't more useful in the
base class.

* Oops, -de & -es should be AspellDictPackages too

* Typo: pakcage -> package

* Address some commentary

* Update copyright dates, 2016->2017

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