add capacity patterns

[oblonski]

Currently, it is easily possible to account for multiple capacity dimensions, i.e. one can specify static limits. For example, a vehicle can load 10 items of type A, 15 of type B and 2 of type C, i.e. capacity -> [10,15,2]. However, one cannot specify dynamic limits such as it can load either 10A + 0B + 0C or 0A + 10B + 2C etc.. If the user fully specifies the pareto set, jsprit should account for this.