v1.0.10: Cumulative bug fixes

• fixed #38
• updated use example for delayed differential equations https://pyrates.readthedocs.io/en/latest/auto_analysis/dde.html#sphx-glr-auto-analysis-dde-py
• TODO: fix issues with numpy backend and past() usage
• added sqrt function to pytorch backend
• fixed dimension problem with external inputs and vectorized networks. Now, different inputs to different network nodes can be passed using the all/operator/variable convention, if the input is an appropriate 2D array.
• merged pull request #40 from PC-DOS/master to fix issue #39 as well as a typo in python_definitions.py