* complete and 'shrink-wrap' windows version
* put path to access log in configfile?
* debian package?
* web-interface?
* visualisation of:
  - how many sessions start at a node
  - how many hits a node gets in the first place
  - how many sessions end at a node
* make 'unify' get regexes
* filters
-> on request, graphs with only the nodes from collections of vistits, 
  selected with a query using a grammar like this:

EXPRESSION:
  EXP;
  { }
EXP:
  'NOT' EXP 
  { all sessions not in 'expression' } |
  'REACHED' '(' NODE ')' 
  { all sessions with transitions to or from 'node' } |
  'EXISTS' '(' NODE ',' NODE ')'
  { all sessions with transitions from node to node };
 NODE:
  'ANY' 
  { } |
  STRING
  { };
    
  used as:
  - where a certain node is or isn't reached
    REACHED ('download.html')
  - a specific transition is or isn't in the path
    EXISTS ('main.html', 'download.html')
  - where a certain node is or isn't the last node
    REACHED ('download.html') AND NOT EXISTS ('download.html', ANY)
  - combinations of these
