removed 'eval.formals' option

Not directly needed for planned check args functionality, and a
pain to implement; could add back later
doc update
test updates
starting to implement 'user.formals', but buggy

interim commit since everything else works fine and
I fear I'm about to break everythin
'user.formals' working

also added tests for that feature
removing old code, hiding test code
removed stray 'eval.formals', doc update

turns out we don't need to specify 'def' for match.call
Doc and Example updates

Cleaned up vignette and examples and other docs.
Updated tests to include all examples.
Version bump, NEWS, and README updates
now unload DLL on detach
adding unitizer store for 0.2.0
updated valgrind tests with all normal tests
added test running file