for-group: better check of group name and fixed make argument

A few issues came up while testing the `for-group' script in one of the
projects based on this pipeline that are being fixed with this commit:

  1) We are ultimately using the `sg' command to use the specified group,
     not `chgrp'. So in cases where `chgrp' has problems, this would cause
     a wrong error. So for the test of the given group's existance, we are
     now directly calling `sg'.

  2) In the call to `make' we were mistakenly giving make the `$2' (which
     is `make' on the command-line) argument. Since `./for-group' now takes
     the group name as its first argument, this should have been `$3'.

  3) To help in readability, and also allow for group names with a space,
     `reproducible_paper_group_name' is now defined and exported before the
     final call to `sg'.

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