[#463] New features for values, deque and ART

[Jubilee101]

• minor behavior adjustments for noop_to_string_cb
• minor fix when adding a tagged node to deque
• ValueRef now prints out pointer address
• deque_exists: if a node with certain tag exists
• deque_remove: remove all nodes with a certain tag
• deque_sort: sort the deque based on tag
• add_with_config: allow customized to_string and destroy callback when adding a node to deque/ART

[jesperpedersen]

Merged.

Thanks for your contribution !