Implement TimeLength TerminationCondition

[fgrosse]

It would be nice if one could specify a maximum time that a simulation may run.
Absolute and relative time values should both be possible:

Examples:

• optimization can run at most 60 seconds
• optimization can run at most 1 hour
• optimization can run at most 2 days
• optimization can run at most 1.5 weeks
• optimization should not run no later than today 19:00
• optimization should not run no later than 03.07.2012

The TerminationCondition interface should be implemented.