GROMACS

The method of selection with GROMACS tools is powerful and flexible http://manual.gromacs.org/documentation/current/onlinehelp/selections.html

However, that power and flexibility means many users struggle with working out the correct syntax to use, particularly if they are a more casual user. Propose to gather a more extensive list of examples http://manual.gromacs.org/documentation/current/onlinehelp/selections.html#selection-examples to assist with this. I'll gather them together here, or in what ever form is best to be then incorporated into the documentation.

Redmine issue opened as suggested by https://twitter.com/GMX_TWEET/status/1139464352812212225