Merge pull request #169 from splitbrain/diff_navigation

_test/tests/inc/changelog_getRevisionsAround.test.php

_test/tests/inc/changelog_getrelativerevision.test.php

_test/tests/inc/changelog_getrevisioninfo.test.php

_test/tests/inc/changelog_getrevisions.test.php

feed.php

inc/RemoteAPICore.php

inc/changelog.php

inc/common.php

inc/form.php

inc/html.php

inc/lang/en/lang.php

inc/media.php

inc/subscription.php

lib/plugins/revert/admin.php

lib/tpl/dokuwiki/css/_diff.css

lib/tpl/dokuwiki/css/basic.less

lib/tpl/dokuwiki/css/mobile.less

lib/tpl/dokuwiki/css/sites/abcwiki.css

lib/tpl/dokuwiki/css/sites/paralis.css