Generic function to clear all objects from .RData in R
clearAll(hidden=TRUE, verbose=TRUE, PBSsave=TRUE, pos=".PBSmodEnv")if TRUE, remove variables that start with a dot(.).
if TRUE, report all removed items.
if TRUE, do not remove .PBSmod.
The pos argument can specify the environment in which to look
    for the object in any of several ways: as an integer (the position in
    the search list); as the character string name of an element in the
    search list; or as an environment (including using sys.frame to access
    the currently active function calls).