fixing sub-task in redmine #1665. 1) uses logger.error if no record in database for model_id stated in settings file (alternatively, we could just add the model record)
fixed broken example in pecan.worldmap function
updated biocro example settings file
fixed tests and examples that broke most recent build 92633e6775fb8e82d787914a899b0ba086c163fb
updated run.meta.analysis function to handle cases where meta-analysis is specified in settings, but no data are available (i.e., trait.data is an empty list)
updated BIOCRO example vignette
removed obsolete tests of database connectivity, fixed minor typo in run.meta.analysis