QMCPy v1.6

What's Changed

• Update gaussian.py to allow for singular matricies. by @zitterbewegung in #369
• QMCToolsCL integration by @alegresor in #362
• Modify plot proj by @fjhickernell in #374
• Update .readthedocs.yaml by @sou-cheng-choi in #375
• Remove mplstyle and add colab compatibility , set output of figures to the current working directory and also add missing scikit-learn dependancies. by @zitterbewegung in #377
• new default lattice generating vector by @alegresor in #376
• v1.6 by @alegresor in #379

Full Changelog: v1.5...v1.6