Fz holo

[FENGSHAN95]

Contributor Checklist:

• I have added tests on phase_ramp

[sk1p]

The code is still not running - please see the output of the test runs, for example this one

[codecov]

Codecov Report

Merging #18 (3c2d9d5) into master (43363eb) will increase coverage by 12.45%.
The diff coverage is 22.22%.

@@             Coverage Diff             @@
##           master      #18       +/-   ##
===========================================
+ Coverage   39.28%   51.74%   +12.45%     
===========================================
  Files           8        8               
  Lines         168      172        +4     
  Branches       15       17        +2     
===========================================
+ Hits           66       89       +23     
+ Misses         97       74       -23     
- Partials        5        9        +4     

Impacted Files	Coverage Δ
src/libertem_holo/base/filters.py	50.00% <22.22%> (+50.00%)	⬆️

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