GLaMM_model

Solves the GLaMM model (Graham-Likhtman and Milner-McLeish) [R. S. Graham, A. E. Likhtman, T. C. B. McLeish and S. T. Milner, J. Rheol., 2003, 47(5), 1171–1200] Also includes the head-tail symmetry correction of Likhtman et al [needs citation]