Check for a file in the input/dbfiles tables

Function to check to see if a file exists in the dbfiles table as an input

dbfile.posterior.check(pft, mimetype, formatname, con,
  hostname = PEcAn.remote::fqdn())

Arguments

pft	the name of the pft that this data is applicable to
mimetype	the mime-type of the file
formatname	the name of the format to distinguish between simmilair mime-types
con	database connection object
hostname	the name of the host where the file is stored, this will default to the name of the current machine

data.frame with the id, filename and pathname of the posterior that is requested

This will check the dbfiles, inputs, machines and formats tables to see if the file exists

# NOT RUN {
  dbfile.posterior.check(pft, 'application/x-RData', 'traits', dbcon)
# }