Fix compatibility with pyuvdata v3.0, use UVData.new

Description

Fix some things that will break in pyuvdata v3.0, particularly related to the new handling of telescope metadata.

This includes moving to using UVData.new for initializing UVData objects, which changes the default conjugation convention from "ant2<ant1" to "ant1<ant2". So I added an option to set the conjugation convention in the parameter yaml files, which was requested in #334. This also naturally fixes #427.

This also fixes the version handling for editable installs. This was missed when we went to the src layout.

Fixes #427 Fixes #334

Motivation and Context

Types of changes

[x] Bug fix (non-breaking change which fixes an issue)
[x] New feature (non-breaking change which adds functionality)
[ ] Breaking change (fix or feature that would cause existing functionality to change)
[ ] Reference simulation update or replacement
[ ] Documentation change (documentation changes only)
[ ] Version change
[ ] Build or continuous integration change

Checklist:

For all pull requests:

[x] I have read the contribution guide.
[x] My code follows the code style of this project.

Bug fix checklist:

[x] My fix includes a new test that breaks as a result of the bug (if possible).
[x] All new and existing tests pass.
[ ] I have checked that I reproduce the reference simulations or if there are differences they are explained below (if appropriate). If there are changes that are correct, I will update the reference simulation files after this PR is merged.
[ ] I have checked (e.g., using the benchmarking tools) that this change does not significantly increase typical runtimes. If it does, I have included a justification in the comments on this PR.
[x] I have updated the CHANGELOG.

New feature checklist:

[x] I have added or updated the docstrings associated with my feature using the numpy docstring format.
[x] I have updated the documentation to highlight my new feature (if appropriate).
[x] I have added tests to cover my new feature.
[x] All new and existing tests pass.
[ ] I have checked that I reproduce the reference simulations or if there are differences they are explained below (if appropriate). If there are changes that are correct, I will update the reference simulation files after this PR is merged.
[ ] I have checked (e.g., using the benchmarking tools) that this change does not significantly increase typical runtimes. If it does, I have included a justification in the comments on this PR.
[x] I have updated the CHANGELOG.

RadioAstronomySoftwareGroup / pyuvsim