licensecheck: add support for wildcards in license text

In license text the sequence ___ now denotes a wildcard
that can be filled in by up to 70 words.
That's long enough for a handful of copyright lines
in a row (see testdata/MIT.t2) but short enough that
it can't skip over an entire license. (Our shortest two
recognized licenses are Apache-2.0-User at 80 and
BSD-0-Clause at 99.)

This commit updates the licenses to use ___ where appropriate.
This fixes #6.

This commit also removes removeCopyrightLines (d686698),
which turns out to have been removing quite a few lines in
actual license text (see diffs in testdata/CC*) and did not
handle other cases now handled by the wildcards
(for example, testdata/MIT.t2). This fixes #12.

Fixes #6.
Fixes #12.

testdata/Apache-2.0.t1

@@ -1,7 +1,7 @@
-# BUG: https://github.com/google/licensecheck/issues/12
-94.3%
-ECL-2.0 82.0% 74,9183
-Apache-2.0 100.0% 9734,$
+# BUG: URL matched in match
+100%
+Apache-2.0 100% 0,$
+Apache-2.0 100% 9904,9942 URL
 
 Apache License Version 2.0, January 2004
 http://www.apache.org/licenses/

testdata/Artistic-2.0.t1

@@ -1,7 +1,5 @@
-# BUG: Mismatch around "Copyright Holder".
-98.5%
-Artistic-2.0 3.4% 0,288
-Artistic-2.0 96.5% 452,$
+100%
+Artistic-2.0 100% 0,$
 
 Everyone is permitted to copy and distribute verbatim copies of this
 license document, but changing it is not allowed.

testdata/CC-BY-4.0.t1

@@ -1,7 +1,5 @@
-# BUG: Mismatch around "Copyright and Similar".
-96.1%
-CC-BY-4.0 5.2% 0,676
-CC-BY-4.0 94.8% 1192,$
+100%
+CC-BY-4.0 100.0% 0,$
 
 Creative Commons Attribution 4.0 International Public License
 

testdata/CC-BY-NC-4.0.t1

@@ -1,7 +1,5 @@
-# BUG: Mismatch around "Copyright and Similar".
-96.2%
-CC-BY-NC-4.0 5.0% 0,704
-CC-BY-NC-4.0 94.3% 1221,$
+100%
+CC-BY-NC-4.0 100% 0,$
 
 Creative Commons Attribution-NonCommercial 4.0 International Public
 License

testdata/CC-BY-NC-SA-4.0.t1

@@ -1,7 +1,5 @@
-# BUG: Mismatch around "Copyright and Similar".
-96.3%
-CC-BY-4.0 5.0% 58,726
-CC-BY-NC-SA-4.0 94.8% 1243,$
+100%
+CC-BY-NC-SA-4.0 100% 0,$
 
 Creative Commons Attribution-NonCommercial-ShareAlike 4.0
 International Public License

testdata/CC-BY-SA-3.0.t1

@@ -1,6 +1,5 @@
-# BUG: Why not 100% for the match?
 100%
-CC-BY-SA-3.0 99.7% 0,$
+CC-BY-SA-3.0 100% 0,$
 
 Creative Commons Attribution-ShareAlike 3.0 International Public
 License

testdata/CC-BY-SA-4.0.t1

@@ -1,7 +1,5 @@
-# BUG: Mismatch around "Copyright and Similar".
-96.3%
-CC-BY-4.0 5.0% 44,698
-CC-BY-SA-4.0 95.2% 1214,$
+100%
+CC-BY-SA-4.0 100% 0,$
 
 Creative Commons Attribution-ShareAlike 4.0 International Public
 License

testdata/GPL2.t1

@@ -1,6 +1,5 @@
-# BUG: Mismatch around leading Copyright line.
-99.8%
-GPL2 99.8% 135,$
+100%
+GPL2 100% 0,$
 
 		    GNU GENERAL PUBLIC LICENSE
 		       Version 2, June 1991

testdata/LGPL-2.0.t1

@@ -1,6 +1,5 @@
-# BUG: Mismatch around Copyright line.
-99.8%
-LGPL-2.0 99.8% 142,$
+100%
+LGPL-2.0 100% 0,$
 
 		  GNU LIBRARY GENERAL PUBLIC LICENSE
 		       Version 2, June 1991

testdata/LGPL-2.1.t1

@@ -1,6 +1,5 @@
-# BUG: Mismatch around Copyright line.
-99.8%
-LGPL-2.1 99.8% 145,$
+100%
+LGPL-2.1 100% 0,$
 
 		  GNU LESSER GENERAL PUBLIC LICENSE
 		       Version 2.1, February 1999

testdata/MIT.t2

@@ -0,0 +1,28 @@
+# This notice appears in go/src/runtime/vlrt.go.
+90.9%
+MIT 100.0% 124,$
+
+// Inferno's libkern/vlrt-arm.c
+// https://bitbucket.org/inferno-os/inferno-os/src/default/libkern/vlrt-arm.c
+//
+//         Copyright © 1994-1999 Lucent Technologies Inc. All rights reserved.
+//         Revisions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com).  All rights reserved.
+//         Portions Copyright 2009 The Go Authors. All rights reserved.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.