datelife v0.6.6

• when congruification fails, return NA and produce a warning on functions that use geiger::congruify.phylo():
  • congruify_and_mrca_phylo()
  • extract_calibrations_phylo()
  • congruify_and_check()
• changes to congruify_and_mrca_multiPhylo():
  • filters out results of congruify_and_mrca_phylo() that do not inherit data.frame; usually this happens when congruification fails
  • correctly assigns congruified phy as attribute
• use_calibrations_bladj.matchedCalibrations() correctly uses calibrations argument
• get_ott_children() added error handling for when OpenTree APIs might be down, or there is no internet connection
• varius fixes to make_datelife_query() et al. functions
• added a new vignette for making datelife query functions (allows testing various functionalities)