Reasons for making this change:

Gretl is an open-source statistics and econometrics software. Even though it's a niche and domain-specific language, there exist already 200+ gretl repositories on github.

Having this .gitignore template-file would be useful on general when working with gretl and git.

Links to documentation supporting these rule changes:

• Chapter 3.1. in the manual mentions the auto-generated session.inp file which is just a log-file of the current session.
• Unfortunately, I could not find a mentioning of the auto-generated temporary file string_table.txt file. This file comprises the mapping from string-valued gretl series to numeric codes, and is only valid as long as a dataset is open. Unfortunately, after closing the gretl session, this file remains and may become part of the versioned source code where it does not belong to.

If this is a new template:

• Link to application or project’s homepage: http://gretl.sourceforge.net/