added function "db.exists" to ouput boolean, if TRUE, tests in PEcAn.DB module can be run.  test if there is a database that can be used. Then added a few quick tests of query.base.
completed move of read.ensemble.output.R, read.sensitivity.output.R, and variance.R from PEcAn.utils to PEcAn.uncertainty
added dump.db.sh; refs redmine issue #1540
removed read.sensitivity / read.ensemble files from utils (these were moved to PEcAn.uncertainty in recent commit); removed obsolete contents of /utils/inst/tests/test (old pecan.xml and two empty folders).
updated units for water conductivity in trait.dictionary.csv
It was difficult to figure out what 'get.run.id' was doing so I simplified it wrote tests. The output should be the same as before although I may not have covered all uses. I suspect it doesn't matter how the values are combined, just that they are combined.
updated documentation for read.output function
added .Rproj.user to .gitignore