add: alg1 - algorithms I
correct: sub-dirs; add: 2011/zp ~ introduction to programming
correction: 2011/zp ~ newest version (from mailbox)
add: 2012/alg2 ~ algorithms II
corrected: 2011/zp; add: 2012/dvt ~ history of science and technology
add: lo ~ logic circuits
add: udbs ~ Introduction to Database Systems