Low-level memory allocation functions

AUTHORS:

• Jeroen Demeyer (2011-01-13): initial version (github issue #10258)

• Jeroen Demeyer (2014-12-14): add more functions (github issue #10257)

• Jeroen Demeyer (2015-03-02): move from c_lib to Cython (github issue #17881)

sage.ext.memory.init_memory_functions()

Set the MPIR/GMP memory functions to the above functions.

EXAMPLES:

sage: from sage.ext.memory import init_memory_functions
sage: init_memory_functions()