remove version from doc blocs

- @version in file header level isn't used on code docs, it is intended
  for API versions at class or method level
- avoids needing to update all these files on version increment
- avoids needing to regenerate SRI hashes for privatebin.js through
  extra phpunit run
- simplifies VERSION_FILES list
- avoids having to filter above list during loop
- adds a few missing doc bloc headers

lib/Model/AbstractModel.php

@@ -7,7 +7,6 @@
  * @link      https://github.com/PrivateBin/PrivateBin
  * @copyright 2012 Sébastien SAUVAGE (sebsauvage.net)
  * @license   https://www.opensource.org/licenses/zlib-license.php The zlib/libpng License
- * @version   1.7.3
  */
 
 namespace PrivateBin\Model;