Rubric_part2.functionality

Functionality of virtual memory subsystem:
- Test paging behavior.
4	page-merge-mm
4	page-merge-stk

- Test stack growth.
3	pt-grow-stack
3	pt-grow-stk-sc
3	pt-big-stk-obj
3	pt-grow-pusha

- Test "mmap" system call.
2	mmap-read
2	mmap-write
2	mmap-shuffle

2	mmap-twice

2	mmap-unmap
1	mmap-exit

3	mmap-clean

2	mmap-close
2	mmap-remove