* [new] HTML Table cell text alignment, see :h vimwiki-syntax-tables.
* [new] Wikipage history simplified. Each vimwiki buffer now holds b:vimwiki_prev_word which is list of [PrevWord, getpos()].
* [new] If highlight for groups wikiHeader1..wikiHeader6 exist (defined in a colorscheme) -- use it. Otherwise use Title highlight for all Headers.
* [fix] Warn only once if 'html_header' or 'html_footer' does not exist.
* [fix] Wrong folding for the text after the last nested list item.
* [fix] Bold and Italic aren't highlighted in tables without spaces between || and * or _. ||*bold*||_asdf_ || (Thanks Brett Stahlman)
