Memory pool implementation
Memory pool implementation

memory_pool class is rewritten. Some of the memory managment
routines are moved to memory_pool.hpp file.

toxa81/sirius,toxa81/sirius,toxa81/sirius,electronic-structure/sirius,electronic-structure/sirius,electronic-structure/sirius,toxa81/sirius,electronic-structure/sirius,electronic-structure/sirius,toxa81/sirius,electronic-structure/sirius,toxa81/sirius,electronic-structure/sirius