An extension class to allocate memory easily with cython.
This extension class started as part of the Sage software.
It provides a single extension class MemoryAllocator with cdef methods
malloc,calloc,alloarray,realloc,reallocarray,aligned_malloc,aligned_calloc,aligned_allocarray.
Memory is freed when the instance of MemoryAllocator is deallocated.
On failure to allocate the memory, a proper error is raised.