Initial commit: imported rlmer.R
DESCRIPTION, package help

Added package dependencies to DESCRIPTION, and started package help.
Removed some files and added some definition of classes

also added some conversion methods.
Corrected mistake in depends.
Merge branch 'master' into s4classes
Corrected psi_func2-class definition and help files.
Merge branch 'master' into s4classes

Conflicts:
	R/psiFunc2.R
Updated classes. Now conversion works allright.
Added tests, new generic functions: std, sumRho and laplace

Also had to change the definition of psiFunc2: chgDefaults is now called
after creating a new object.
robll, detCov, NAMESPACE

Also added implicit arguments checking (for sigma) via signature. Corrected
a mistake in detCov("rreTrms").
Added argument use.rho.sigma to laplace and sumRho
Added std method for matrices.
Laplace function, allowing zero vc

Added some accessor functions, had to require stats4 to import
nobs. Created "forced imports": isDiagonal, isTriangular (Matrix) and
isREML (lme4a).

Matrix Q now omits all the zero variance components.

Extended tests in rlmerMod.R to include also ML variants and a dataset
where there are just some vc dropped.
First functional version

Added some new generic methods, to set values more easily. First version
using optim without any gradients.
Fixef replaces coef, updates more than just coef

The functions theta and fixef now also update required other terms in the
merMod object.
Added some tests for fixef<- and theta<-
Added gradient functions, init argument

Theta is wrongly optimized towards 0. Error not found yet.
isREML for rlmerMod object

otherwise we are coercing all the time.
More debugging and tests

Problem still not solved, but reversed update for beta and u, so that
residuals are calculated correctly.
Added slot b. std(re) now works on b instead of u.