Open and execute the Molmol macro file.
file: The name of the Molmol macro file.
dir: The directory name.
This user function is for opening and running a Molmol macro located within a text file.
To execute the macro file `s2.mac' located in the directory `molmol', type:
[numbers=none] relax> molmol.macro_run(file='s2.mac')
[numbers=none] relax> molmol.macro_run(file='s2.mac', dir='molmol')