Use a function closure.
pirls working but not correctly.  Changes in pls to allow fill-reducing perm.
Use a function closure.
pirls working but not correctly.  Changes in pls to allow fill-reducing perm.
Merge branch 'db/radicalrewrite' of github.com:lme4/lme4pureR into origin-db-radicalrewrite
Update man pages and tests.
Put cu, RZX and DD in the function closure.
Fix documentation to keep R CMD check quiet

but the pirls example still fails.
Modifications to pirls but still not working properly.
Pirls modified for increment form but still not giving good results
Clean up environment of devfun

rename the values of the unscaled conditional density as `ucden` and the objective returned as `pdev`

Use the correct logical condition to decide when to write the passed beta into the local environment.
Expanded the pirls test suite.
One more try at pirls, extended the Contraception example
Add notes to example and to pirls docs.
Fix updates so they take place in the correct environment.

Also remove a term from the Laplace approximation that causes disagreement with lme4 results.
added comments to PIRLS.R
updated description and readme
merged radicalrewrite into master