Fixed import problems with inconsistent XML tsplib files.
Renamed tsplib.py to tsp.py
Added tsp to __all__ in __init__.py from util folder.
(can do now: from PyGMO.util import *)
Added tsp.py to cmakelists install file.
Commented out knapsack and aco from everywhere necessary to be able to make
(only references to algorithms.h and problems.h and tests + wrappers)
Made some changes to base_tsp and tsp, added headers for BGL and defined graph type.