Change the python package name (space-bench suggested)

[mauriciogtec]

Since space is taken in the Python registry, a new name must be chosen. space-bench is available.

As per conversion, the code would be invoked from Python as

import space_bench

Or

import space_bench as space

[Naeemkh]

I like the name, although the use of underscores is discouraged (PEP8). How about spacebench?