initial src folder
inital commit
add basic data structure
completing basic data structure
optimization of constraint data structure
adds some scaladoc and completes the parseConstraint method in PBCompetitionReader class
refactoring PBCompetitionReader and the datastructure
modifies the string2Term method. Now each variable is only computed once
refactoring the parser
adding the ID instance to PBLVariable
refactoring the read method