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parse_cmd_line

# Arguments: none
#            
# Return Values: $P$            : VGconditionals 
#                $C$            : VGcode
#                $L$            : LOC
#                $T$            : LOconditionals
#                $D$            : DirectiveListing
#                $E$            : ExpressionListing
#                $outfile$      : ouput file (optional)
#                $scale_factor$ : graph scale factor (optional)
#                $graphfile$    : graph output file (optional)
#                $infile$       : code input file 
# Description: Parses the command line parameters according to the grammar
#              specified in &print_usage().