Get rid of segmented_array test
Get rid of segmented_array and collapse array_facade/array_base/array class hierarchy
Get rid of p_t and child_t typedefs in array
Get rid of self() calls in array
Gather methods that directly modify m_elements/m_tss_used in array
Add support for allocators in tpie::array
Add ut-array allocator test
Merge branch 'array'. Closes #37.