an object of S3 class "sessionInfoX", a list
with components (there may be more, experimental and not yet listed here):
sInfosimply the value of sessionInfo().
pkgDescrIf pkgs was non-empty, a named
list of packageDescription()s for each
entry in pkgs.
libPaththe value of .libPaths().
RLIBSa character vector of entries from
Sys.getenv("R_LIBS"), typically very similar to the
libPaths component.
n.RLIBSsimply a normalizePath()ed version of RLIBS.
R.enva named character vector with the “important” R
environment variables R_ENVIRON, R_PROFILE,
R_CHECK_ENVIRON.
xR.envif extraR.env was true, a named character vector
of “all R related” environment variables, as specified in
extraR.env's description above.
%% FIXME: unfinished