R/qtl version 1.20-15

[Karl Broman]

A new version of R/qtl (1.20-15) has been released at its web site
(http://www.rqtl.org). It should be on CRAN within a couple of days.

There were a number of important bug fixes. See
http://www.rqtl.org/STATUS.txt for a list of changes. The major
changes are below.

Karl Broman
kbr...@biostat.wisc.edu

------

Version 1.20, 2/18/2011:

Major changes:

Enabled est.map to use multiple processors via snow; added argument
n.cluster to indicate the number of cluster nodes to use.

Added the option stepwidth="max" in calc.genoprob, sim.geno, and
argmax.geno. This inserts the minimal number of pseudomarkers so
that the maximum step between points is as indicated by the "step"
argument.