Fix some issues reported by lintian

Fix some issues reported by lintian

• Refer to common license file for CC0-1.0. (copyright-does-not-refer-to-common-license-file)
• Update standards version to 4.6.1, no changes needed. (out-of-date-standards-version)

Debdiff

These changes affect the binary packages:

[The following lists of changes regard files as different if they have different names, permissions or owners.]

Files in second set of .debs but not in first

-rw-r--r--  root/root   /usr/lib/debug/.build-id/0d/5ff65ae2aa7dd8c8d992387eebfdf882c1d943.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/81/fe69c81d895b0e1fddc07f3e8fcbc742c4d4fe.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/90/78910001dbbaac754ecfc232a64d9c77104d4f.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/07/906da91848b50578dcf1b741fbcd5f022339fd.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/33/30ba314baa377afc2e89cf499a3bfba441cbf2.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/b4/90fefa88aa7e63d00b7fb7305b54bf38ea9a14.debug

Control files of package entangle: lines which differ (wdiff format)

• Depends: gir1.2-entangle-0.1, dconf-gsettings-backend | gsettings-backend, libc6 (>= 2.33), 2.34), libcairo2 (>= 1.2.4), libgdk-pixbuf-2.0-0 (>= 2.22.0), libgexiv2-2 (>= 0.6.1), libgirepository-1.0-1 (>= 0.9.2), libglib2.0-0 (>= 2.37.3), libgphoto2-6 (>= 2.5.10), libgphoto2-port12 (>= 2.5.10), libgstreamer1.0-0 (>= 1.0.0), libgtk-3-0 (>= 3.21.5), libgudev-1.0-0 (>= 146), liblcms2-2 (>= 2.2+git20110628), libpango-1.0-0 (>= 1.14.0), libpangocairo-1.0-0 (>= 1.14.0), libpeas-1.0-0 (>= 1.1.0), libraw20 (>= 0.16.0), libxext6

Control files of package entangle-dbgsym: lines which differ (wdiff format)

• Build-Ids: 07906da91848b50578dcf1b741fbcd5f022339fd 3330ba314baa377afc2e89cf499a3bfba441cbf2 b490fefa88aa7e63d00b7fb7305b54bf38ea9a14 0d5ff65ae2aa7dd8c8d992387eebfdf882c1d943 81fe69c81d895b0e1fddc07f3e8fcbc742c4d4fe 9078910001dbbaac754ecfc232a64d9c77104d4f

No differences were encountered between the control files of package **gir1.2-entangle-0.1**

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Build and test logs for this branch can be found at https://janitor.debian.net/lintian-fixes/pkg/entangle/0e7ceb9d-c1ce-413b-91d9-0352cdcfaa1a.