fixes redmine #1561 by fixing and renabling tests in the PEcAn.utils package; only the logger functions in utils/inst/tests/test.logger.R don't seem to work, (I have updated the issue with more details)

Conflicts:

	utils/DESCRIPTION
moved approx.posterior function from PEcAn.utils to PEcAn.MA
removed utils/inst/tests/test.read.output.R; I am revising this in a separate branch
Merge branch 'master' of github.com:PecanProject/pecan