New reaction HathorMSR, updates to reaction HathorSingleTop and a CIJET example
New reaction HathorMSR, allowing to use the MSRn and MSRp renormalization schemes in inclusive ttbar production. Added s, t and Wt channel functionality to HathorSingleTop along with flags for perturbative order and treatment of cases mu_r != m_t. Also included an example for previously added CIJET reaction.