[FIX] Preprocess: Filter by absolute frequency

[VesnaT]

Issue

Fixes #597

Description of changes

Add a radio button to distinguish between relative and absolute frequency option.

Includes

• Code changes
• Tests
• Documentation

[ajdapretnar]

I like this option and it works well, but the tests are failing with settings migration. I think the test just needs to be updated.

[codecov-io]

Codecov Report

Merging #601 (6e9aad7) into master (c894c72) will increase coverage by 3.16%.
The diff coverage is 78.49%.

@@            Coverage Diff             @@
##           master     #601      +/-   ##
==========================================
+ Coverage   71.03%   74.20%   +3.16%     
==========================================
  Files          66       66              
  Lines        7638     7780     +142     
  Branches     1017     1036      +19     
==========================================
+ Hits         5426     5773     +347     
+ Misses       2023     1799     -224     
- Partials      189      208      +19     

[ajdapretnar]

One thing I have noticed with this. I might be nitpicking, but it could be important. If I select Absolute frequency, then change the parameters in Relative (without selecting Relative!), preprocessing is run once again. I don't think it is necessary. Is there a simple fix for this?

[VesnaT]

One thing I have noticed with this. I might be nitpicking, but it could be important. If I select Absolute frequency, then change the parameters in Relative (without selecting Relative!), preprocessing is run once again. I don't think it is necessary. Is there a simple fix for this?

This has been fixed.