first pass at pred/sim refactor
mostly functional first stab
test fixing for REform -> ReForm
Merge branch 'master' into predsim
Merge branch 'master' into predsim
Merge branch 'master' into predsim
doc fixes for predict/simulate
Merge branch 'master' into predsim
na.action fix for simulate; one simple test
fix beta setting; simulate with formula
simulate with formula/data (trivial models)

add RHSForm, RHSForm<- utilities to operate on 1-/2-sided formulae
allow trivial (no-y) models in most places
add simulation functions copied from family()$simulate (not used yet)
allow simulate() with formula/data only specified
Merge branch 'master' into predsim

Conflicts:
	R/modular.R
	R/utilities.R
	tests/predsim.R
clean up merge trash
Merge branch 'master' into predsim

Conflicts:
	R/lmerControl.R
Merge branch 'predsim' of ssh://github.com/lme4/lme4 into predsim
oops, more merging
simulate.formula and simulate docs

added check.formula.LHS
added simulate.formula
doc cleanup
Merge branch 'predsim'

Conflicts:
	R/lmerControl.R
	R/modular.R
	R/predict.R
	R/utilities.R
	man/lmerControl.Rd
	tests/predict_basis.R