SAV writer: Use internal names that are more SPSS compatible
SAV writer: Use internal names that are more SPSS compatible

So far we've been using V1_A, etc., but SPSS doesn't seem to like this
conventions when it comes to merging Very Long Strings. So, try to mimic
the SPSS behavior, capitalizing and uniq'ing the variable name.

WizardMac/ReadStat,WizardMac/ReadStat