add Distribution function
update coryright year
testing spatial function does not need to be combined with mesh nodes. make it simple
add tests for generating distributed nodal values
added test for point on side of plane and point inside tet
added method for testing if point is inside element for all element types
added tests
formatting issues
added optional eps for 3d calculation
added more tests
Split long lines.
added method to test if element is located on boundary
added const qualifier
Merge pull request #482 from rinkk/TestBoundaryElements

Test if mesh element on boundary
Merge pull request #32 from endJunction/add-gen-distribute

Add gen distribute
remove unused declare and headers
add a function to search connected element ids
initial implementation of BoundaryElementSearcher class
use Node::getElements()
correct a function name