UnionFind struct exported from union_find package.
Len method added to union_find package.
Introducing percolation package.
Percolation package extended.
Advanced sites connectivity functionality implemented.
Percolates method added.
Percolation threshold calculation method added.
Opened method added.
Bug fixes and small improvements.
Simple percolation calculation utility impemented.
Refactoring.
Calculating percolation with any number of cycles.
Printing calculation time.