to track the beginning/ending points for each record and append
continuation records onto the previous. There's some issue in
the pyaccuwage-pdfparse script causing it to have problems reading
the last record field in a record group. Maybe the record extractor
needs to dump the last failed ColumnCollector rather than return it
if it's determined to hold junk data?
The record builder seems to handle everything just fine.
Added a function to the field name parsing to replace ampersands
with an "and" string so as not to cause problems with variable names.
