All tests pass most of the time.
moved most test code into modules.
New TestCase for onboard sensors.
all tests passed.
Tests for onboard sensors and onboard oscillator turn-on.
Add analog output and loopback tests. split tests by configuration of analog ports.
Make Rserver default interface from ruby to R.
Make DataFrame class methods instance methods.
So more than one DataFrame can exist.
Add eval rescue, import, Examples,etc.
Update default preconditions.
Merge branch 'master' of https://github.com/GregLawson/Open-Table-Explorer

Conflicts:
	test/unit/default_test_case.rb
Add log to R type for interactive debugging in R command line environment.