use relative imports inside MDPOW

[orbeckst]

• fix Fix import error in workflows base module (develop branch) #245
• avoid circular imports involving the workflows.registry

[orbeckst]

@cadeduckworth have a look at this PR. These relative imports work, at least in local testing. If this looks good to you, approve and merge.

[codecov]

Codecov Report

Merging #257 (7ce55c4) into develop (afb1ced) will decrease coverage by 0.02%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop     #257      +/-   ##
===========================================
- Coverage    80.74%   80.73%   -0.02%     
===========================================
  Files           15       15              
  Lines         1906     1905       -1     
  Branches       294      294              
===========================================
- Hits          1539     1538       -1     
  Misses         276      276              
  Partials        91       91              

Impacted Files	Coverage Δ
mdpow/workflows/base.py	81.63% <100.00%> (ø)
mdpow/workflows/dihedrals.py	94.87% <100.00%> (-0.05%)	⬇️
mdpow/workflows/registry.py	100.00% <100.00%> (ø)

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[cadeduckworth]

@orbeckst

Looks good, thank you for catching this!

I noticed things of this nature here and there while reviewing and finishing up #243, probably from early stages of development. Once #243 is merged and we start working on #244 I think that will result in a complete cleanup of the entire workflows module and related test modules.

Reminder, when time allows, there are still issues that exist that require revisiting the analysis modules and tests for revisions mostly required by software package updates (i.e., pytest).