adding to unit tests, though they fail.

I think I am testing 'out of range' for the F-statistics, but have not spotted
it yet. annualization may be the problem.
adding random generation tests;

still having issues with coverage of confint.sropt, but they don't
seem to be too far off. takes too long to run for common testing,
though.
passes make check

removed questionable se method, loosened estimation tests.
adding more examples

and making reannualize work for sropt.
working on the vignette.

and the system for quickly rebuilding the vignette.
putting 'MASS' and 'quantmod' into suggests b/c they appear
in the examples.
adding rmvnorm examples.
restoring deleted files;

committed after a make clean. oops.