checkMD5sums2 - added the omit_files parameter (allowing the removal of the files ‘etc/Rconsole’ and ‘etc/Rprofile.site’ from the checksums of an R installation)

Also:

install.R - started using checkMD5sums2 instead of checkMD5sums in order to allow the manual removal of the files ‘etc/Rconsole’ and ‘etc/Rprofile.site’ from the checksums (they are changed during the R installation process, and always give an error massage)