Bugfix: td_occup with states parallelization and isolated systems

Description

Fix various problems related to the header of td_occup output for isolated systems in states parallelization.

News snippet

Fix various problems related to the header of td_occup output for isolated systems in states parallelization.

Checklist

• I have checked that my code follows the Octopus coding standards
• I have added tests for all the new features added in this request.

changed milestone to %10.0

added Bug label

Codecov Report

Merging #629 into develop will decrease coverage by <.01%. The diff coverage is 83.33%.

@@             Coverage Diff             @@
##           develop     #629      +/-   ##
===========================================
- Coverage    71.24%   71.24%   -0.01%     
===========================================
  Files          465      465              
  Lines        88120    88122       +2     
===========================================
+ Hits         62785    62786       +1     
- Misses       25335    25336       +1

Impacted Files	Coverage Δ
src/td/td_write.F90	59.16% <83.33%> (-0.02%)

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approved this merge request

merged

mentioned in commit fca7b957

added in Changelog label