Add new arguments to plot.scanone, to plot points instead of lines
Add to TODO.txt
Fix problem with formLinkageGroups w/ markerlrt() results
Revise parallel code for Windows

  - Revised parallel code (in scanone, scantwo, mqmpermutation, and
    mqmscanall) to use clusterApply() for Windows, as mclapply()
    doesn't work there.
Fix bug in scanqtl in case of missing values in phenotype
Update version number in INSTALL_ME.txt
Update date