documentation changes
initial commit of sphinx documentation
update to documentation
reimplement calculation of periodogram maxima
better mcmc plots; method to reset the burnin
experimental save option in plot; new create command; burnin is now set more interactively
allow for empty lines
allow default in ask_yes_no
working on demc; generating synthetic 'planets'
example RV file
add DEMC files (only these?)
update ignore rules