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To have a simple way to genrate tables and to avoid multiple generation
of generatecolumnnames those two functions were created.

generatecolumnnames: Will source all column scripts and store all
   getcolumnname() to COLUMNNAMES variables, to any use later at the
   script

starttable(): will create all necessary headers for table generation,
   such as ID, class div and span, and will already create the first
   line of the table which is $COLUMNNAMES
   Also this function is able to read $TABLEATTRIBUTES, which will carry
   some table attributes, default is border=1 and can be overwriten by
   wwwsdi.conf
Signed-off-by: Bruno Ribas <ribas@c3sl.ufpr.br>