Flashx reader

[dpugmire]

Description

Provides support to read FLASHX formated files with the FLASH plugin. FLASHX uses a logarithmic grid in the X direction.

Type of change

• Bug fix~~
• [ x] New feature~~
• Documentation update~~
• Other~~

How Has This Been Tested?

Reminders:

• Please follow the style guidelines of this project.
• Please perform a self-review of your code before submitting a PR and asking others to review it.
• Please assign reviewers (see VisIt's PR procedures for more information).

Checklist:

• [x ] I have commented my code where applicable.~~
• I have updated the release notes.~~
• I have made corresponding changes to the documentation.~~
• I have added debugging support to my changes.~~
• I have added tests that prove my fix is effective or that my feature works.~~
• I have confirmed new and existing unit tests pass locally with my changes.~~
• I have added new baselines for any new tests to the repo.~~
• I have NOT made any changes to protocol or public interfaces in an RC branch.~~

[JustinPrivitera]

Is this ready for review?