Memory_limit incorrectly described in info text

[Rohan-Meerhaeghe]

In generic.py the argument description of memory_limit for the server class is now:
memory_limit (str): memory required

    .. attribute:: memory_limit

        the maximum amount of RAM allocated for the calculation in GB

I suggest the last line to be replaced by:
the maximum amount of RAM per core allocated for the calculation (e.g. "1500MB")

[niklassiemer]

I just looked up the code and the defaults in the pysqa, if it is a number, it should be interpret as GB. If it is a string, like '1500MB' it should be interpret accordingly.