Drop vanity email address

Update of 'ChangeLog' file

Use \doi in 'mblogit.Rd'

Better support of starting values and more stable PQL/MQL algorithm

`mclogit()` and `mblogit()` now have an infrastructure that allows
to provide starting values for models with random effects.
Starting values should be given for the coefficents and for
the variance parameters. If the PQL method is used, also
starting values for the random effects have to be provided.

The PQL/MQL algorithm is made more stable by re-using in for the inner iteration
the intermediate estimates of coefficients, variance parameters, and random
parameters from previous outer iterations.

Fixed bug in 'blockMatrix' and make it check for argument validity

Hotfix of prediction method

Update NEWs.Rd and ChangeLog

Added support for non-nested random effects.

Detect some misspecified models (with too many groups)

Update ChangeLog and NEWS.Rd