Tracing functions leave some computation even when compiled with NoTrace option

[SeungheonOh]

Reported by @bladyjoker , we want tracing function to erase all computation related to that trace message, i.e. pshow, when we are compiling with NoTrace option. This seems to be not the case currently. Need to investigate and fix if it is not working as we desire.

[L-as]

pshow and co. probably need to check if tracing is enabled or not and if so not do anything.