* lisp/org.el (org-image--align, org-image-align,
org-toggle-inline-images): Add the ability to left-align, center
or right-align inline image previews in the Emacs window. This is
controlled globally using the new user option `org-image-align'.
Alignment can be specified per image using the `#+ATTR.*'
affiliated keywords. The function `org-image--align' determines
the kind of alignment for its argument link.
* lisp/org-lint.el (org-lint-invalid-image-alignment): Add an
org-lint checker to catch invalid ":align" and ":center"
attributes in `#+attr_org' keywords.
* doc/org-manual.org: Document the new feature under the Images
section.
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