makeHomotopies1 -- returns a system of first homotopies

Synopsis

Usage:

H = makeHomotopies1(f,F,d)
Inputs:
- f, a matrix, 1xn matrix of elements of S
- F, a chain complex, admitting homotopies for the entries of f
- d, an integer, how far back to compute the homotopies (defaults to length of F)
Outputs:
- H, a hash table, gives the homotopy from F_i corresponding to f_j as the value $H#\{j,i\}$

Same as makeHomotopies, but only computes the ordinary homotopies, not the higher ones. Used in exteriorTorModule