now sending a 'fatal' when remapping tree if taxon id is not found in
database.
remapping tree to ti before calibrating; subcommand now works well with
the primate example
added check if parameters 'sfreq' and 'lfreq' are set
adding MaxAge to fossil calibration. tested on primates example.
added MaxAge column
added fossil calibration to workflow
changed documentation for get_root_level
check for parallel libraries now at run-time and not when compiling
default for add_outgroups argument (-g) is now set to false
now also supports grafting of a single tree when given as '-c' argument
fixed indentation