brian ripley's fix of the profile.merMod bug that arises with lazy_duplicate_ok
tried clearing external pointer, but no dice
Hack from https://stat.ethz.ch/pipermail/r-devel/2014-March/068448.html to address issue #186
small
force-copying hack: addresses (fixes?) #186
tweak (cosmetic)
more LAZY_DUPLICATE_OK

change forceCopy() to +0
revert profile re-fitting
Merge branch 'lazy_duplicate_ok'