Added configuration option 'user', which if defined and not empty will add a username to the path of a measurement, right between the root directory and the datestamped
directory. The option can also be overridden by specifying a new argument called user that has been added to Data.create_file(), and a Parspace object will do this if it has a
property named user with any other value than None.
Also adapted the qtlab-starting shell scripts for *nix so they use python2 on a system where both Python 2 and Python 3 are installed.
Finally I added a missing import statement to the testParspace measurement script.
Added a GUI element to set the user. Currently it's just functioning as a text field, but in the future it should also have a dropdown menu with some common users as well as
functionality to add a common user by pressing enter. Also, the last
user from a previous session is remembered but this is not yet reflected
in the GUI initialisation.
Merged branches
Fixed bug in qtlab startup script inaccurately checking boolean variable, resulting in always preferring ipython2