Some declaration mods for more C++ style.
Merge pull request #1 from evaleev/master

Added Eigen-based read-ints version + integral-direct version
Update README.md
Merge pull request #2 from evaleev/master

sync with EV fork ... "efficient" fock build works too.
Some adjustments for more C++ style.
Trivial bits.
Merge pull request #3 from evaleev/master

sync with EV fork: improved efficiency, added timing
Merge pull request #4 from evaleev/master

sync with EV fork ... SOAD guess, etc.
Merge pull request #1 from lothian/master

sync with lothian:S2I2