allowed atoms in tbtnc, and enabled PDOS of ADOS in viz

[zerothi]

Enables plotting electrode PDOS from tbt.nc siles.

Simply do fdf.plot.pdos(source="tbtnc", data_kwargs=dict(elec=0).

• Closes #
• Added tests for new/changed functions?
• Documentation for functionality in docs/
• Changes documented in CHANGELOG.md

[codecov]

Codecov Report

Attention: Patch coverage is 46.66667% with 8 lines in your changes missing coverage. Please review.

Project coverage is 86.98%. Comparing base (04c70d1) to head (c7dd064).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/sisl/viz/data/pdos.py	0.00%	8 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #871   +/-   ##
=======================================
  Coverage   86.97%   86.98%           
=======================================
  Files         403      403           
  Lines       52555    52559    +4     
=======================================
+ Hits        45712    45716    +4     
  Misses       6843     6843           

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