text: Title: Fix ParallelCoordinates tests and add fast parameter
  Body: See #420 
  
  - [x] fix image comparison tests for parallel coordinates 
  - [x] add `fast=False` argument and docstring 
  - [x] create fast and regular drawing methods based on parameter 
  - [x] add section in documentation explaining fast vs. slow 
  - [x] update #230 and #59 