Refactored power VM allocation policies, removed old policies, reimplemented the DVFS and single threshold policies

The power package and corresponding examples are being heavily updated, as well as new PlanetLab workload data are added. Currently, the package is not in the working state and will be fixed soon; however, the org.cloudbus.cloudsim.examples.power.random.NonPowerAware example is already working and can be run.

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- VmSchedulerTimeShared and VmSchedulerTimeSharedOverSubscription were refactored to isolate the method
that decides MIPS shares in case of oversubscription.

- CloudSimExample1 has been reverted to its original version.

Issue #8: CloudSim.terminateSimulation(long time) changed to CloudSim.terminateSimulation(double time),
to comply with clock field of CloudSim class.

maufunctions in the schedulers.

Solved issue #14: to avoid rounding problems, ResCloudlet processes length in Instructions rather than Millions of Instructions.

Issue solution not tested: 8

- updates in comments
- Location of topology file fixed for network examples

- Fixed energy calculation: if fromUtilization == 0 and toUtilization == 0, it's assumed that the host is switched off and therefore energy is 0.