Correct LauFlatteRes to use the exact formulae from the papers that report the default parameter values for each supported resonance, fix #77

• Deals correctly now with the cases where the m0 is absorbed into the couplings
• Now uses the correct value of g1 for the a_0(980) (needed to be squared)
• Also sets the mass values to those reported in those papers
• Added printout to specify what is being done in each case