tweaks from Frid 7/9
merge in changes from home
nonlinear: put library prereqs in comments

since they are part of the package dependencies.
import rather than depend on the packages I use

import is generally preferred to depend.
However, it may fail if the package being imported itself has
dependencies.
must depend on HybridMC

Previous version complained "couldn't find mcmc" at end of hybridMC run.
This is 50% slower at CAPS, 425s.
merge in upstream changes for 2.17

Only conflict was in DESCRIPTION because I reordered them.
It changes .R->.r for all files, and new date and version.
comment the use of "global" variables
merge in changes from master

I'm not sure why there aren't more changes; I guess I had already merged
them in.  E.g., all files end in .r not .R