v0.5

• Fixed median offset processing in sorted_flat_deque::pop_front() and pop_back().
• Added sorted_flat_deque::front() and back().

v0.4

• Fixed median offset processing. The comparator is now a three-way.
• Added ability to specify position_t via SORTED_FLAT_DEQUE_POSITION_T definition.
• circular_buffer::clear() now does not change max_size().

v0.3

Fixes in sorted_flat_deque::operator=.

v0.2

Added simple benchmark.