refnx/refnx: REL: v0.1.16

build more Linux wheels. vendored ptemcee (bleeding edge), so it's no longer necessary to install it. use -funsafe-math-optimizations for reflectivity calculation. fixed bug when retrieving log-probabilities from PTMCMC sampling. fixed encoding call for Py3 (.decode doesn't exist for Py3). improve pymc3 model creation. pymc3 offers different ways to carry out MCMC sampling. This may lead to pymc3 being included as a sampling method in Curvefitter. implement invcdf method for Bounds objects. This will allow creation of prior transforms from [0, 1) to the original range specification. BREAKING CHANGE: objective.model.logp and Objective.logp_extra are now included in the log-likelihood (Objective.logl) instead of log-prior (Objective.logp). This makes it easier to work with pymc3 and dynesty. Add Objective.prior_transform that converts random variates in a unit hypercube to parameter values, according to their prior distributions. manual_beam_find can be sent a name to be displayed on the window title. ReductionOptions dict is now used for specifying options for reduction and processing of reflectometry data. This will permit different settings to be used for datasets measured in different configurations. Add AutoReducer, an object that watches a directory for modified/created files and automatically reduces them