Build: Rewrite Makefile (#1293)

* Rewrite Makefile
Now we can use make CC=mpiicpc, make CC=mpicxx to compile parallel version
use make CC=icpc or CC=g++ to compile serial version.
use make pw CC=mpiicpc/mpicxx/icpc/g++ to compile pw version with LCAO.
use make test to run Autotest.sh

* merge develop;fix wrong link for easy_install.md

Co-authored-by: Wenfei Li <38569667+wenfei-li@users.noreply.github.com>