Member doCalculation (char *buf): lcalc exits if there is a math error;
must set in place a math_err handler
Also, the command line args are not evaluated first.
lcalc doesn't know what to do with the command and exits.
Member doLetCmd (char *buf): Can not modify a header variable. If called with a header variable,
then system will create a dynamic variable with the same name.
Probably not what you want.
Need to change this behaviour
Member doQshow (void): The xaxis is ignoring different resolutions
Member doQshow (void): The xaxis is ignoring different resolutions