Started work on JAMA-like interfaces. This first step is an enhancement of the existing QR-decomposition interface and associated implementation in JAMA-style, i.e with added getH() method and most importantly various solve methods for least-squares solution of the A * X = B equation. JIRA: MATH-220
commons/proper/math/branches/MATH_2_0/src/java/org/apache/commons/math/linear/DecompositionSolver.java