Fix pwscf analyzer when eigenvalues touch

[mcbennet]

Proposed changes

Small change to pwscf_analyzer. QE can print touching eigenvalues, e.g., -144.9938-144.9938, which then prevents the bands from being stored.

What type(s) of changes does this code introduce?

• Bugfix

Does this introduce a breaking change?

• No

What systems has this change been tested on?

ORNL CADES

Checklist

• Yes. This PR is up to date with current the current state of 'develop'
• Yes. Code added or changed in the PR has been clang-formatted
• No. This PR adds tests to cover any new code, or to catch a bug that is being fixed
• No. Documentation has been added (if appropriate)

[qmc-robot]

Can one of the admins verify this patch?

[prckent]

OK to test

[prckent]

Ah, the joys of fixed format output in 2021!