Enable loading of best known solutions for mult-depot VRP

[pfleck]

Currently, the .opt format is used for storing the best known solution for a VRP instance. This rather simple format does not support storing vehicle assignments, which necessary for multi-depot and heterogeneous-capacity VRP instances.

To enable support for solutions which require more information than the current format, either an enhancement of the current format or a new format is required. It would be also possible to load and interpret the raw solution format given from various sources (similar to the different formats for instances).

[pfleck]

r11420

• Changed the Content type of VRPInstanceProviderView. In the previous version the VRPInstanceProviderView is not used correctly as default View for VRPInstances and therefore the VRPImportDialog is not shown.
• Made IVRPInstanceProvider generic for consistency and to avoid unnecessary casts.

[pfleck]

r11428

• The IVRPData now specifies an optional BestKnownTourVehicleAssignment property. This can be used for solutions where a specific assignment for tours to vehicles is necessary.
• The VRPInterpreter interpret the new BestKnownTourVehicleAssignment directly as VehicleAssignment in the created PotvinEncoding.
• Minor refactoring in (I)VRPInstanceProvider.

[pfleck]

r11429

• Implemented parsing of own solution format for Cordeau instances. (Only works for CordeauMD p-class instances yet)
• Added CordeauMD and CordeauMDTW solution files.

[pfleck]

r11432

• Fixed 2 Bugs in Cordeau parser
  • some solution files contain empty lines
  • depots are not always identified with a zero, but sometimes with their depot number
• Improved error message in VRP unit test

[pfleck]

r11442 Added specific culture when parsing doubles in Cordeau solution parser.

[pfleck]

r11455

• Added Homberger known solutions.
• Implemented solution parser in SolomonFormatInstanceProvider.
• Updated Homberger instances to match the original file names.
• Changed ordering of VRP instances to natural string ordering.

[pfleck]

r11456 Added missing PluginDependency.

[pfleck]

r11478

• Added fall-back for solution parsing to try the own .opt-Format.
• Parsing uses InvariantCulture instead of a specific one.
• Small refactoring.

[ascheibe]

This ticket had the wrong milestone and was thus overlooked. It blocks ticket #2247 from stable because #2247 had a commit on VRPInstanceProvider based on a commit from this ticket.

[abeham]

r11930: fixed url for reference

[abeham]

r11931: merged to stable