Parser module cleanup

Description

Removed unused single precision interfaces plus some cosmetic changes.

News snippet

Parser module cleanup

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 %11.0

Codecov Report

Merging #950 into develop will increase coverage by 0.02%. The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop     #950      +/-   ##
===========================================
+ Coverage    70.74%   70.76%   +0.02%     
===========================================
  Files          511      511              
  Lines        99614    99579      -35     
===========================================
- Hits         70474    70470       -4     
+ Misses       29140    29109      -31     

Impacted Files	Coverage Δ
src/basic/parser.F90	74.07% <ø> (+12.89%)

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approved this merge request

merged

mentioned in commit 7ee00d4a

assigned to @sohlmann