allow configuring allowed source-sink relations for flowrouter (trac #3416)

[behrisch]

either

• [ ] as whitelist with capacity
• [x] as blacklist in restriction file

Migrated from http://sumo.dlr.de/ticket/3416

{
    "status": "new", 
    "changetime": "2017-09-20T11:33:50Z", 
    "description": "either\n* as whitelist with capacity\n* as blacklist in restriction file", 
    "reporter": "namdre", 
    "cc": "", 
    "resolution": "", 
    "_ts": "1505907230878684", 
    "component": "tools (python)", 
    "summary": "allow configuring allowed source-sink relations for flowrouter", 
    "priority": "major", 
    "keywords": "", 
    "time": "2017-09-12T14:41:19Z", 
    "milestone": "1.0.0", 
    "owner": "", 
    "type": "enhancement"
}

[behrisch]

@namdre committed d9ea306 (aka r26015): now supporting od-based restrictions. refs #3416

[behrisch]

@namdre committed lying to [comment:1 namdre]:

!CommitTicketReference repository="" revision="26015"