DONE: - Highlight non-existent WikiWords.
DONE: - delete current WikiWord (<Leader>wd)
DONE: - g:vimwiki_smartCR=2 => use vim comments (see :h comments :h formatoptions) feature to deal with list items. (thx - Dmitry Alexandrov)
DONE: Add highlighting to TODO:, DONE:, FIXED:.
DONE: Rename current WikiWord - be careful on Windows you cannot rename wikiword to WikiWord. After renaming update all links to that renamed WikiWord
FIXED: Bug - do not duplicate WikiWords in wiki history.
FIXED: after renaming [[wiki word]] twice buffers are not deleted
FIXED: when renaming from [[wiki word]] to WikiWord result is [[WikiWord]]
FIXED: more than one complex words on one line is bugging each other when try go to one of them. [[bla bla bla]] [[dodo dodo dodo]] becomes bla bla bla ]] [[dodo dodo dodo
