change 'sropt.inference' to 'inference'

and cut out the hotelling and F stuff from the public API.
dropped files added in.
un-zeta sample stats
sropt from xts; other fixes.

na.omit takes output. duh.
adding real examples using quantmod.
adding disclaimer.
removing dT2 etc from public API;

no need to expose them, is only more trouble.
adding more examples.
moving to 'epoch' instead of 'year'

meaning 'opy' -> 'ope', and change a lot of the documentation.
adding power.sropt_test

and that's it, I think. add examples and tests. and vignette.
removing lambda prime and co-sropt from API

the public need not see them.
packaging tasks: usage and roxygen.
fixing print and S3 methods.
fixing S3 Rd for print, confint

made proper roxygen incantations to get S3 methods to appear in correct Rd file.
making more use of template magic.
adding coverage tests

starting to test coverage of confint. se should be next.
turns out testthat can test non-exported functions. so add back distribution
tests on plambda, co-sropt, etc.
still futzing with S3 Rd