✨ Add fractional coordinates and displacement parameter commands

[Baharis]

Add a simple functionality to write down fractional coordinates and displacement parameters from the cif file into a table. Transforming the displacement parameters currently does not correctly modify the values of displacement parameters.

[codecov]

Codecov Report

Attention: Patch coverage is 95.12195% with 2 lines in your changes missing coverage. Please review.

Project coverage is 94.80%. Comparing base (e2c4db3) to head (e36f311).
Report is 10 commits behind head on master.

Files with missing lines	Patch %	Lines
picometer/atom.py	89.47%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master       #6      +/-   ##
==========================================
- Coverage   94.81%   94.80%   -0.01%     
==========================================
  Files          10       10              
  Lines         636      674      +38     
==========================================
+ Hits          603      639      +36     
- Misses         33       35       +2     

☔ View full report in Codecov by Sentry.
📢 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.