created cobb2003FULL and DamassaFULL - combined all sections into one series for relative normalisation. only relevant for cobb I think... medina-elizalde removed NAs so should be able to use it now in P.
added cobb2003 FULL, set indivs Invert to NA. Damassa records changed to d18O clim anomaly rather than just d18O (for prev commit)
barron ave'd data from same yrs, cobbFULL changed date to yrBP