Changes

This is a major feature release which includes many bug fixes and a security fix. Major additions include the addition of 9 new frame order models, execution locking, support for CCPN Analysis 2.1 peak lists, Monte Carlo simulations for the N-state model, optimisation of the Ln3Ln³⁺ position in the N-state model, weighting of RDCs and PCSs during optimisation, and no longer using execfile() closing a security hole.