Pvgeo

The flagship python module is now called `PVGeo`

Completely overhauled the PVGPpy module to be ready for the transition to using `VTKPythonAlgorithmBase` subclasses outlined in [Merge Request !2516](https://gitlab.kitware.com/paraview/paraview/merge_requests/2516/) for ParaView.

We will be phasing out the `src` directory and XML build scripts on the `rebuild-pvpy` branch moving forward.

By using `VTKPythonAlgorithmBase` subclasses moving forward, we can deliver a single Python module that can be used both as a standalone package in Python environments or imported to ParaView to harness plugins from the Graphical User Interface.

**Proceed with caution until next minor release: *0.8.0***

Filters with multiple inputs now put each input on its own port using the input selector to select inputs by name. Check out the `src/filters_general/example_filter_mult.py` (**Example Filter Multiple Inputs**) to see how to use filters with multiple input ports and to see how to use choosing input arrays to process.

In addition to the following new features, I went on a bug hunting sprint and overhauled many of the file readers to squash out quirky bugs and implement stable solutions for most tasks and data parsing.

Notable New Features:
- **The Model Building Suite:** There is a new beta Model Building plugin suite dedicated to creating various types of rectilinear grids alongside your data. I will soon implement the ability to save those model discretizations out to common formats like the UBC Tensor Mesh. Check out the new **Sources->PVGP Model Building** menu and take a look at the **Create Odd Rectilinear Grid** model generator.
- **Multiple Inputs:** Filters with multiple inputs now use the input selector to select various inputs by name. Check out the `src/filters_general/example_filter_mult.py` (**Example Filter Multiple Inputs**) to see how it works.

Completely overhauled the plugins to be separated into various suites. [Learn more](http://pvgp.io/plugin-suites/about-plugin-suites/)

This release marks a significant rename and rebranding of the PVGP code library. The name has been shortened to **PVGeophysics** to be a bit shorter and catchier while helping give the code base a brand.