lots of clean up on periodic bcs. Now working with inplace and sparse…

[cmhamel]

… vector stuff.

[codecov]

Codecov Report

❌ Patch coverage is 91.30435% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 72.07%. Comparing base (20aabf1) to head (26f541a).
⚠️ Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
src/bcs/PeriodicBCs.jl	86.66%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #313      +/-   ##
==========================================
+ Coverage   71.35%   72.07%   +0.71%     
==========================================
  Files          53       53              
  Lines        5321     5339      +18     
==========================================
+ Hits         3797     3848      +51     
+ Misses       1524     1491      -33     

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.