remove deplicated getInfo()

getInfo() has replaced by plugin.info.txt since DokuWiki 2009-12-25
Lemming.
use plugin config variable "dt_fancy" instead of  DL_FANCY
plugin config variable "stylename" for dl element

apply default class explicitly to dl element. use blank to render most
simple dl list.
Merge remote-tracking branch 'ssahara/css-flexible'
Change stylename to classname, fix up docblocks, and extend testing.