minor bug fixes

#note: allow deterministic maps to be list() - treated as NULL
#note: pass nodes instead of Anodes, Cnodes... to NonpooledMSM (there
was a bug with default Qform otherwise)
#note: fixed minor bug in output of CheckDeterministicACNodeMap
#note: fixed bug where summary printed var instead of std error
started fixing major det.ac.map bug - looks fixed but still lots to clean up

bug was that det.ac.map didn't apply to abar
replaced det.ac.map with function
still to do:
rename det.ac.map, document (clean example), fix det.Q.map, fix det.Q
example (disabled), include example det.g.function,
Merge branch 'testing-log-tricks'

merged changes to implement Sam's log tricks (use logitQ instead of Q)
Merging in the rest of Josh's changes
Moving test-* files to tests/testthat