get pH corners Function
Returns the values of the pH values of the limit function i.e. where the limit is c(0,1,1,0) Reads these in from the microbe group dataframes
getPHcorners(microbeNames, pHLimit)
microbeNames
: (vector of strings). Names of microbes in the systempHLimit
: (logical) Is microbial growth affected by pH?(matrix) values of the pH values of the limit function i.e. where the limit is c(0,1,1,0). Row names are microbeNames