* Changing instances of the word “excerpt” by the word “content”
instead in classes, functions, ids, etc. Using a familiar wp term
instead of an easily mistyped one. :)
* Adding helper: full_size_src(): strips query string from urls, to get
full size (OMMV)
* Adding default empty form and related hidden fields to base HTML
* Adding render_default_form_field_values() for base form, so it’s
ready to submit as soon as loaded if user is happy with defaults.