SNN: add mass extinction victims to SHAP

SNN: log BD rates when using -fixShift

bug fixes -tuneT and -bound_se

SNN: infer mass extinction victims

enable relative pathnames of log file for -plot

restore log_sp_q_rates sys exit message

restore shift times and lam/mu from RJMCMC runs

optional tuning of window sizes for q rate and alpha proposals

SNN: add qShift as dashed lines to taxon-time specific plots

BDNN: no proposals for masked weights

log taxon-specific sampling rates and small fix for age-dependent SNN

restore_mcmc for BDNN with fixed ts/te

bug fix plotting taxon-time specific sampling rates

fix for HPD of taxon-time specific sampling

snn: include HPD to taxon-time-specific sampling r-scripts (no plotting though