  | #### D.6.12.5 control_Matrix Procedure from library `equising.lib` (see equising_lib). Assume: L is the output of multsequence(hnexpansion(f)). Return: list M of 4 intmat's:
        M[1] contains the multiplicities at the respective infinitely near points
             p[i,j] (i=step of blowup+1, j=branch) -- if branches j=k,...,k+m pass
             through the same p[i,j] then the multiplicity is stored in M[1][k,j],
             while M[1][k+1]=...=M[1][k+m]=0.
        M[2] contains the number of branches meeting at p[i,j] (again, the information
             is stored according to the above rule)
        M[3] contains the information about the splitting of M[1][i,j] with respect to
             different tangents of branches at p[i,j] (information is stored only for
             minimal j>=k corresponding to a new tangent direction).
             The entries are the sum of multiplicities of all branches with the
             respective tangent.
        M[4] contains the maximal sum of higher multiplicities for a branch passing
             through p[i,j] ( = degree Bound for blowing up)
Note: the branches are ordered in such a way that only consecutive branches can meet at an infinitely near point. the final rows of the matrices M[1],...,M[3] is (1,1,1,...,1), and correspond to infinitely near points such that the strict transforms of the branches are smooth and intersect the exceptional divisor transversally. See also: multsequence.

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