Revert "The fallback license should require at least attribution."

Revert from master branch.

This reverts commit 53f1f1d70c5ed0add9f0ce542b1801c5d5f12e8c.
Generalize non-exclusion of implied licenses.
Delete explicit non-exclusion of implied patent licenses subclause.

This text originates in the final sentence of GPLv3 section 11.

I believe it is either unnecessary belt-and-suspenders drafting or
else merits some further legal research before re-inclusion (or both).
Slightly clearer wording of exclusion part of 'Licensed Patents' definition.
Clarify OSI-approval reference in Proprietary Relicensing section.
Reformat section 4, with minor clarification.

Previously, there was a parenthetical indicating that notice
preservation applied to Derived Works only to the extent they remain
pertinent. The wording f the clause might seem to sggest that this
"pertinence clarification" applies only to "legal notices" and not
also "textual author attributions".
Change title of section 6 to "Pass-Through".

The previous term, "direct licensing", was one I learned from Till
Jaeger and Axel Metzger in the GPLv3 process. GPLv3 itself uses
"automatic licensing" in the title of section 10. I have heard at
least one US lawyer refer to the automatic licensing provision of GPL
as a "pass through" and I have decided to adopt such terminology in
the title.
Merge branch 'master' of git://github.com/richardfontana/copyleft-next
Fix typo reported by Engel Nyst in Product Distribution section.
Eliminate non-year-defined definition of Minimum Period.

This change returns the 'Product Distribution' section a bit closer to
GPLv2, as the deleted language originates in a change introduced in
GPLv3. My admittedly-vague justification for this change is that, for
shipment of a given Product, there could be significant variance in
the offering of support or spare parts across Product
instances. Consider restoring this after further analysis.
Moved "Licensed Patents" definition to Definitions section.

With this change all defined terms are in the final section of the
license.
Reformat termination provision.
Add gitorious URL to later-license-versions section.
Broaden Proprietary Relicensing section to cover "copyleft trolling".

The Proprietary Relicensing provision should also apply in
circumstances where 'We' (perhaps including licensors downstream from
the original licensor) offer to forgive past or future noncompliance
with respect to a work 'We' do not distribute (e.g., what would be a
downstream Derived Work but which is created by someone lateral to
'you') through purchase of a proprietary license.

There is some evidence that some purported GPL licensors are engaging
in such behavior (rather than the more familiar case of announcing at
the outset that proprietary licenses are available for the
GPL-licensed work distributed by the licensor, or some enhanced
version of it).
Adjust line lengths in Proprietary Relicensing section.
Fix case-o.
Date-qualify OSI-approved license set in Proprietary Relicensing provision.

The date 1 January 2013 is arbitrary (another option might be to use
the date of publication of a given released version of
copyleft-next). The point is to fix the set of OSI-approved licenses
to guard against the possibility of pathological future OSI license
approval decisions (however unlikely or remote that may be).
Fix line lengths.
Better phrasing of mailing list plank of HBR.
Fix line lengths in CONTRIBUTING.md.