Minor changes and edits related to 2.0

[n-claes]

PR description

Various minor changes and edits to the source code related to the 2.0 release.

Overview

Legolas

• changed the io and solver settings objects type names to be more consistent
• renamed duplicate physics_t type, the one from settings is now called physics_settings_t
• made radial derivative of para/perp thermal conduction into type-bound procedures instead of pointers
• logging of equilibrium inspections now occurs after initialisations

Bugfixes

Pylbo

• fixed duplicate Doppler continuum in hydrodynamics with flow (fixes Pylbo: duplicated Doppler continuum #131)

[codecov]

Codecov Report

Merging #132 (7d56f32) into develop (cb16927) will increase coverage by 0.05%.
The diff coverage is 91.12%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #132      +/-   ##
===========================================
+ Coverage    90.54%   90.60%   +0.05%     
===========================================
  Files          158      158              
  Lines         8949     8970      +21     
===========================================
+ Hits          8103     8127      +24     
+ Misses         846      843       -3     

Flag	Coverage Δ
legolas	93.03% <90.55%> (+0.06%)	⬆️
pylbo	86.13% <100.00%> (+0.04%)	⬆️

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