merging new_design branch into OOPSE-2.0
add getArray function to RectMatrix and Vector classes
Snapshot and SnapshotManager in progress
except diagonalize(), all of functions in math library pass the test
more bugs get fixed at math library
more tests on math library
math library in progress
math library in progress
Matrix in progress, test in isOrthogonal of SquareMatrix is failed by some reasons
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