- adding mem_heap_try_resize_block routine that tries to resize
block using free space that is located right after the resized block;
- placing long-term blocks from start of heap space and short-term - from end
of the space to increase probability of success of resizing just allocated
long-term block;
- adding mem_heap_try_resize_block invocation to 'test_heap' unit test.
Ruben Ayrapetyan