Workflow for linear molecules

[sgoodlett]

The goal of the PR is to complete the SALC workflow for linear molecules.

• Symtext
• Internal coordinates
• Cartesian coordinates
• Spherical harmonics
• ProjectionOp

Addresses:
#35

[codecov]

Codecov Report

Attention: Patch coverage is 44.82759% with 16 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
molsym/symtext/symtext.py	21.42%	11 Missing ⚠️
molsym/symtext/symtext_helper.py	0.00%	3 Missing ⚠️
molsym/symtext/general_irrep_mats.py	0.00%	2 Missing ⚠️

Flag	Coverage Δ
unittests	79.97% <44.82%> (+0.86%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
molsym/pgdetect/flowchart.py	97.82% <100.00%> (+0.09%)	⬆️
molsym/salcs/projection_op.py	75.28% <100.00%> (+37.78%)	⬆️
molsym/symtext/general_irrep_mats.py	90.45% <0.00%> (ø)
molsym/symtext/symtext_helper.py	78.46% <0.00%> (-2.50%)	⬇️
molsym/symtext/symtext.py	66.46% <21.42%> (-4.40%)	⬇️

🚀 New features to boost your workflow:

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