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Warning in case of high CPU time in filters

The CPU time reported in the output file is limited to time integration, but some of the filters might actually result in update times of the same order of magnitude that is not reported to the user. This feature produces a summary of this sort every IO_FiltersInfoSteps (10 times IO_InfoSteps by default):

Total filters CPU Time:			     0.0607356s

If the solver is run with the verbose flag, the output is for instance:

CPU time for filter Energy:                  0.0357917s  
	 Percentage of time integration:     45.3867%  
CPU time for filter AverageFields:           0.000315254s
	 Percentage of time integration:     0.399768% 
CPU time for filter ReynoldsStresses:        0.0064476s  
	 Percentage of time integration:     8.17608%  
Total filters CPU Time:			     0.0425545s
Edited by Andrea Cassinelli

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