Removed to unused variable declarations.
Merge pull request #603 from Morwenn/remove_useless_variables

Removed to unused variable declarations.
Merge branch 'master' into cpp11
Fix declaration of Point operator+.
Remove relational operators of Points and add comments.
Document Size.
Fix order or parameters.

It was wrong for doors, but there was no consequence.
Fix doxygen comment.
Remove empty destructor.
Fix typo in comment.
Merge branch 'cpp11' into shared_ptr
Use the C++11 using syntax instead of typedef.
Remove unused function.