tijdelijke commit
first LP document and changed graph document
Merge branch 'master' of github.com:jhdvries/steiner-algorithm into LP_testground

Conflicts:
	src/graph.cxx
first columns in LP environment
first version, LP uses edge variables for columns 4*4 matrix
4*4 matrix to LP conversion edge variables done and solved
adjusted counter mistake for x[6]
included requirement function class, also tested
to be removed, but has convenient notation
added a class that contains a target, source and an edge, such that we can add flow from target to source over edge as a variable in our LP
LP(7) first trial
LP(7) temporary requirement function and improved cost function
version now compiles and creates graph
Version compiles and returns incorrect LP solution to steinerLP
this program compiles but does not yield a solution
introduce dummy comparison operator, to allow usage in std::map
renaming files because changing the class to take Arcs instead of Sources
Problem is the direction of the arcs
first working version
this version runs and returns correct solution