introduced working spinor fields in monomial.h|c and replaced all
g_spinor_fields in *monomial.c

reduced the number of g_spinor_fields in hmc_tm.c

g_spinor_field[0]|[1]|[2]|[3] are still used in some hmc_tm relevant
source files. Should be removed, too.
the functionality of init_phmc is moved to a new function
init_nd_poly_monomial
in ndpoly_monomial.c.
we have now a mapping established between old phmc_* variables and
monomial counterparts:

phmc_Cpol;                         --> MDPolyLocNormConst
phmc_cheb_evmin, phmc_cheb_evmax;  --> EVMin, EVMax
phmc_invmaxev;                     --> EVMaxInv
phmc_root;                         --> MDPolyRoots
phmc_dop_n_cheby;                  --> MDPolyDegree
phmc_dop_cheby_coef;               --> MDPolyCoefs
phmc_ptilde_n_cheby;               --> PtildeDegree
phmc_ptilde_cheby_coef;            --> PtildeCoefs
replaced phmc_* variables with monomial ones where possible
now several ndpoly_monomials are allowd
removed dependencies in degree_of_polynomial_nd and degree_of_Ptilde
on phmc_* variables.

removed the global variables g_acc_Hfinal and g_acc_Ptilde which are
now monomial dependent.
added a first version of a cloverndpoly monomial
phmc_exact_poly removed
Merge branch 'master' into NDTwistedClover
Corrected sample input file and roots for the POLY monomial.
Merge remote branch 'origin/master' into NDTwistedClover
just some cleaning and first steps towards including clover for ND
Naming scheme for nd operators adapted to the single flavour case
theoretical background added
some mistakes corrected and nd-twisted-clover notes started
docu for nd clover added
resolved conficts
merging conflicts resolved
moved test to c99complex
cu test for six_invert