add full multi-select expansion
updates from linas

R powershell: Add code to convert the Unicode
file into an ASCII file with Unicode characters
converted into escaped Unicode (\unnnn).

CSV.xsl: Refinding the data record failed
if the event and/or item group had a repeat key

R_factors.xsl: Correct issue with escaping ‘\’ character

R_dataframes.xsl: Include your as.date(),
correct issue with escaping ‘\’ character,
create empty dataframes for itemgroups that don’t have data