licensecheck: add Blue Oak Model License 1.0

Also add test case for CommonsClause, missed earlier.

Fixes #9.

Author: rsc

testdata/BlueOak-1.0.t1

@@ -0,0 +1,59 @@
+100%
+BlueOak-1.0 100% 0,$
+
+# Blue Oak Model License
+
+Version 1.0.0
+
+## Purpose
+
+This license gives everyone as much permission to work with
+this software as possible, while protecting contributors
+from liability.
+
+## Acceptance
+
+In order to receive this license, you must agree to its
+rules.  The rules of this license are both obligations
+under that agreement and conditions to your license.
+You must not do anything with this software that triggers
+a rule that you cannot or will not follow.
+
+## Copyright
+
+Each contributor licenses you to do everything with this
+software that would otherwise infringe that contributor's
+copyright in it.
+
+## Notices
+
+You must ensure that everyone who gets a copy of
+any part of this software from you, with or without
+changes, also gets the text of this license or a link to
+<https://blueoakcouncil.org/license/1.0.0>.
+
+## Excuse
+
+If anyone notifies you in writing that you have not
+complied with [Notices](#notices), you can keep your
+license by taking all practical steps to comply within 30
+days after the notice.  If you do not do so, your license
+ends immediately.
+
+## Patent
+
+Each contributor licenses you to do everything with this
+software that would otherwise infringe any patent claims
+they can license or become able to license.
+
+## Reliability
+
+No contributor can revoke this license.
+
+## No Liability
+
+***As far as the law allows, this software comes as is,
+without any warranty or condition, and no contributor
+will be liable to anyone for any damages related to this
+software or this license, under any kind of legal claim.***
+

testdata/CommonsClause.t1

@@ -0,0 +1,12 @@
+100%
+CommonsClause 100% 0,$
+
+The Software is provided to you by the Licensor under the License, as defined
+below, subject to the following condition. Without limiting other conditions in
+the License, the grant of rights under the License will not include, and the
+License does not grant to you, the right to Sell the Software. For purposes of
+the foregoing, “Sell” means practicing any or all of the rights granted to you
+under the License to provide to third parties, for a fee or other consideration,
+a product or service that consists, entirely or substantially, of the Software
+or the functionality of the Software. Any license notice or attribution required
+by the License must also include this Commons Cause License Condition notice.