org-odt.el: Sanitize formatting of Images
* contrib/lisp/org-odt.el (org-odt-format-frame): New.
(org-odt-format-textbox): Use the above function.
(org-export-odt-do-format-image): Use the above two functions.
Use the new custom styles for the Frame and Graphics elements.
(org-odt-image-attrs-from-size): Remove this.
* contrib/odt/styles/OrgOdtAutomaticStyles.xml: Removed all
Frame and Graphics entries.
* contrib/odt/styles/OrgOdtStyles.xml: Added following custom
styles - OrgSimpleGraphics, OrgCaptionedGraphics,
OrgCaptionFrame, OrgInlineGraphics and OrgInlineFormula.