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This patch adds support for tracing procedural statement execution in vvp. This is accomplished by adding a new opcode that is inserted before the code that represents a procedural statement. These opcodes also trigger a message whenever time advances. By default these opcodes are not added. To add them, pass the -pfileline=1 flag to the compiler. In the future we may add support for turning the debug output on and off once the opcodes have been added with a system task or from the interactive prompt.