checklist: Textpattern tag changes #118

A list of behavioural changes in tags that will need documenting (please add additional items if I've missed any):

• txp:article tag accepts breakform attribute.
• txp:article_custom tag accepts breakform attribute.
• txp:output_form tag accepts context and format attributes.
• txp:css tag accepts additional options for format attribute.
• txp:link_to_next tag accepts context attribute. 4.7.2
• txp:link_to_prev tag accepts context attribute. 4.7.2
• txp:page_url tag accepts context attribute. 4.7.2
• txp:permlink tag accepts context attribute.
• txp:if_different tag accepts test attribute.
• Article lists (actual tag(s) TBC) can be split by breakby form value.
• Global escape="ordinal|spell|url" attribute values.
• Global trim and default attributes.
• Global wrapform attribute.
• aria_label and placeholder attributes on comment input fields.
• txp:search_input can be used as a container tag, and also accepts aria_label and placeholder attributes.
• txp:variable tag accepts add, output, reset and separator attributes.
• txp:section_list accepts valueless exclude attribute so non-searchable sections can be omitted from txp:section_list output. 4.8.0
• txp:category_list tag's sort attribute now respects categories attribute instead of requiring sort="" override.
• txp:item tag added. 4.8.0
• Added title attribute to image tags. 4.8.0
• Added class attribute to comment form tags. 4.8.0
• Added month and time attributes to <txp:file_download_list /> and <txp:linklist> tags. 4.8.0
• Added pg, total and limit attributes to <txp:newer /> and <txp:older /> tags. 4.8.0
• Custom fields support from/to date filtering. 4.8.0
• Support for id ranges in some tags and admin fields. 4.8.0
• Global evaluate, replace and yield attributes. 4.8.0
• Ability to trim lists when using valueless trim attribute. 4.8.0
• Added size attribute to <txp:images> tag to filter by aspect ratio. 4.8.2