Trajectory -> Gaussview readable ".log" file

[benrich37]

Hello! So as the title implies, I am suggesting adding a method which takes a Trajectory object and produces text file with the formatting of a Gaussian log file so that it can be read by Gaussview, similar to core.trajectory.Trajectory.write_Xdatcar.

I've already written this up something similar for my own personal use, but since I have no official affiliation with Gaussian, I wanted to propose the idea for this PR here before spending any time writing a proper implementation incase this method violates any terms of service I'm unaware of.

[shyuep]

I support this.