New options for mkiqdemo script

Prior to Sybase IQ 15.1, the scripts mkiqdemo.bat and mkiqdemo.sh created the IQ demo database in the current directory using a relative path, and you could not create a multiplex using this database. The scripts now accept two new parameters, -absolute and  -relative. Running either script with the parameter -absolute changes the SQL script to create the IQ demo database with the full path name. Use -relative to retain the old behavior of the scripts.