Fix Jupyter after Installing FEniCS

After I installed FeniCS from conda-forge Jupyter notebook cannot start, with error messages like

...libstdc++.so.6: version `GLIBCXX_3.4.20' not found

This is due to FEniCS being built with a deprecated version of gcc. The solution that I found
(instead of recompiling cython and other affected packages with old gcc)
is to install a newer version libgcc.

$ conda install libgcc=5.2.0

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