Consider setting permissions when writing files on shared drive

[dragly]

This is system-dependent, but on Norstore the folders are automatically not writable by group members after creation. This is an issue that should be addressed on Norstore, but could also be part of expipe.

1. This can be fixed by automatically changing permissions on folders in expipe. This might be unexpected, and should be done with caution. Another option is to put a config file in the root data folder which tells expipe to enable this feature.

2. Alternatively, all users must add the following to their .bashrc config files:

umask g+w

If the second option is chosen, we could include a warning prompting the user that they should update their .bashrc if they haven't already.

[lepmik]

Will this still be a problem when using the filesystem and git LFS? @dragly