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Refactor applybeam stokes i

Mattia Mancini requested to merge refactor_applybeam_stokesI into master

Small refactor fix. Applied to the test proposed by @offringa I see a minor speed up of 50 seconds on the whole run:

BEFORE:


2024-Aug-13 12:05:17.067681 Total DP3 time    1329.69 real     19342.4 user       53.82 system
2024-Aug-13 12:05:17.067689     0.2% ( 2183 ms) MSReader
2024-Aug-13 12:05:17.067723    98.8% ( 1313  s) DDECal solve.
2024-Aug-13 12:05:17.067727            49.5% (  650  s) of it spent in predict
2024-Aug-13 12:05:17.067731            49.2% (  646  s) of it spent in estimating gains and computing residuals
2024-Aug-13 12:05:17.067735             0.0% (    4 ms) of it spent in writing gain solutions to disk
2024-Aug-13 12:05:17.067739           Substeps taken:
2024-Aug-13 12:05:17.067743

AFTER:


2024-Aug-13 14:25:55.047551 Total DP3 time    1278.19 real     18035.1 user       50.06 system
2024-Aug-13 14:25:55.047558     0.1% ( 1851 ms) MSReader
2024-Aug-13 14:25:55.047579    98.7% ( 1262  s) DDECal solve.
2024-Aug-13 14:25:55.047584            47.8% (  602  s) of it spent in predict
2024-Aug-13 14:25:55.047588            51.0% (  643  s) of it spent in estimating gains and computing residuals
2024-Aug-13 14:25:55.047591             0.0% (    4 ms) of it spent in writing gain solutions to disk
2024-Aug-13 14:25:55.047595           Substeps taken:
Edited by Mattia Mancini

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