VM-alloc critical_applications

MIT changes

Code: renamed program

Code: redesigned to (1) read all parameters from a file and (2) also post-process the solver results

Paper: ILP section updated

Paper: Problem formalization section updated

code: now also minimizing the number of VMs of the same tenant allocated to the same PM

code: program again fully functional, now with full support for VM groups of given size and reservations

Code: perl program being modified so that it can cope with changed input format

code: changed perl program to read the yml files of the new format

code: input format changed to add more support for VM replica groups as well as to more easily scale the input