DeepXDE v0.11.0

We stop the support of Python 2.7 from this release.

Areas of improvement

• Vectorize geometry related methods
• PDE supports resample PDE residual points via callback PDEResidualResampler
• Implement Polygon.boundary_normal()

New APIs

• Add multifidelity DeepONet

API changes

• Geometry-related methods (inside, on_boundary, on_initial, boundary_normal, periodic_point) now use the 2d input of shape N by d, not a 1d vector.