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The routine solves the real system of linear equations for X:
A*X = B
A is a square symmetric positive-definite matrix.
The columns of matrix B are individual right-hand sides.
The columns of X are the corresponding solutions.
The matrix B is overwritten by X.
The Cholesky decomposition is used to factor A as:
A = UT*U, if uplo = 'U' or A = L*LT, if uplo = 'L'
U is an upper triangular matrix.
L is a lower triangular matrix.
The factored form of A is then used to solve the system of equations A*X = B.
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