VM-alloc branch-and-bound

Hotfix for PM comparators.

Fixed PM order when one PM is off and the other one is on (this was wrong in all comparators).

Fixed the case where both PMs are off for the sum comparator.

Improved PM sorting.

PM sorting now differentiates between PMs which are on/off.
-> PMs on are sorted in ascending order and put at the start of the list.
-> PMs off are sorted in descending order and put at the end of the list.

Also fixed a typo in the SortType enum.

Added simplistic configuration file support.

A sample config file is added for demonstration purposes.

Other minor modifications:
- Added toString function for SortType
- Hotfix for unsafe function sprintf
- Added WIN32 defines for ILP solvers
- Updated makefile
- Added header guard to ProblemGenerator.h
- Updated VS project

ProblemGenerator can now do a First-Fit allocation so that the generated initial mapping is not that bad

Added wrapper to ILP solvers Gurobi and Lp_solve

Other sorting methods for VMs, VMs without an initial PM.

Added different sorting methods for VMs, similarly to the way it works by PMs.

VMs without an initial PM are now supported, allocating these never cause migrations, regardless of the destination.

Migration limit, iterative cost computation.

Introduced a new parameter with which the number of migrations allowed can be limited.

The cost of an allocation is now computed iteratively, instead of recalculating the total cost at each allocation. The number of PMs turned on and the amount of migrations are tracked in two member variables.

Additional PM sorting options.

The new methods for PM sorting can be set with the PMSortMethod parameter.

Presentation, new branch version, Makefile.

Added a presentation to the trunk version.

Added a new branch version (also containing a Makefile).
Features of the new version:
- Linux compatibility when creating files
- Logging option for cost changes
- Timeout
- Bound threshold

Created a new folder structure.

Currently working and documented version is in the "trunk" folder.

The version in the "branch" folder can contain experimental, undocumented changes.