Merge pull request #118 from runehaubo/master

Implementing checkZdims to check no. random-effects versus no. observations
better refclass copying in refitML
tests and controls for check.nobs.vs.nRE
paper over (not necessarily fix!) #116
docs for check.nobs.vs.nRE
satisfy the latest CRAN  NOTEs
long overdue (from print() changes)
- replacing sapply() by vapply()
- indentation and less return()s in findbars() etc
fix ordering bug in bootMer/vcconv

reported by Reinhold Kliegl
applies for vector random effects with length>2
fixed issue #111. thanks to vince dorie for pointing out this bug
added test for issue #111
set confint for boundaries; closes #113
clean up fix for #111
add reference to arm::sim
update NEWS
fix refit (close #122); update NEWS

add some generic fits to test data
add Rune's examples for issue #47
tweak lmerControl docs for user-spec. optimizer

convergence code==0 signifies OK (in contrast to
e.g. nloptwrap, where convergence code>0 signifies OK)
update release notes
bootMer fixes