This reverts commit 5ba8a96a.

Issue #2608722 by DuaelFr: Follow-up for #2590403: Remove forgotten references to the target attribute in the drupallink CKEditor plugin

Issue #2598070 by Wim Leers, jaxxed, DuaelFr, Haza, Reinmar, oleq: [regression] CKEditor Link button does not show if HTML filtering is enabled

Issue #2585173 by Wim Leers, Jelle_S, DuaelFr, nod_, Reinmar, attiks: [regression] "Allowed HTML tags" setting corrupted upon accessing Text Format configuration UI

Issue #2510380 by Wim Leers, DuaelFr, mlewand, quicksketch, Reinmar, oleq: Images cannot be linked in CKEditor

Revert "Issue #2510380 by Wim Leers, DuaelFr, mlewand, quicksketch, Reinmar, oleq: Images cannot be linked in CKEditor"

This reverts commit 2d342c0f.

Issue #2510380 by Wim Leers, DuaelFr, mlewand, quicksketch, Reinmar, oleq: Images cannot be linked in CKEditor

Issue #2589779 by Jelle_S, Wim Leers: Uncaught TypeError: Cannot set property 'float' of undefined when switching text formats

Issue #2548195 by nod_, JohnAlbin, madhavvyas, sriharsha.uppuluri: Only use single quotes in JavaScript and update .eslintrc

Issue #2579979 by Jelle_S, attiks, nod_, Wim Leers: Allow contrib to alter EditorImageDialog/EditorImageDialog and have custom attributes be stored

Issue #950534 by mparker17, mgifford, Mixologic, jbloomfield, erinclerico, theMusician, wmostrey | zirvap: [policy] Consistently use email instead of e-mail in Drupal.

Issue #1913510 by erich_s, jibran, scresante, nod_, mitron: Core Javascript Files Not Using Standard Indentation.

Issue #2093077 by Wim Leers: Fixed target attribute is set to '0' when creating a link without checking the 'Open in new window' checkbox.

Issue #2071957 by Wim Leers: Fixed Cannot change existing images or links through Text Editor's image/link dialogs.

Issue #1879120 by quicksketch, Wim Leers, larowlan, frega: Use Drupal-specific image and link plugins — use core dialogs rather than CKEditor dialogs, containing alterable Drupal forms.