Reverse the pseudo filters to lead to positive fluxes

CIGALE discards the negative fluxes.  We must reverse the pseudo filters
used for absorption line indices to produce positive fluxes.

database_builder/filters/PSEUDO_H_beta.dat

@@ -2,10 +2,10 @@
 # energy
 # H beta pseudo filter
 4827.87 0.0
-4827.875 -0.2857959417043478
-4847.87 -0.2857959417043478
-4847.875 0.34782608695652173
-4876.625 0.34782608695652173
-4876.63 -0.2857959417043478
-4891.625 -0.2857959417043478
+4827.875 0.2857959417043478
+4847.87 0.2857959417043478
+4847.875 -0.34782608695652173
+4876.625 -0.34782608695652173
+4876.63 0.2857959417043478
+4891.625 0.2857959417043478
 4891.63 0.0

database_builder/filters/PSEUDO_H_delta.dat

@@ -2,14 +2,14 @@
 # energy
 # H delta pseudo filter
 4041.5 0.0
-4041.6000000000004 -0.1415428166967742
-4079.75 -0.1415428166967742
+4041.6000000000004 0.1415428166967742
+4079.75 0.1415428166967742
 4079.8 0.0
 4083.3999999999996 0.0
-4083.5 0.25806451612903225
-4122.25 0.25806451612903225
+4083.5 -0.25806451612903225
+4122.25 -0.25806451612903225
 4122.3 0.0
 4128.4 0.0
-4128.5 -0.1415428166967742
-4161.0 -0.1415428166967742
+4128.5 0.1415428166967742
+4161.0 0.1415428166967742
 4161.1 0.0

database_builder/filters/PSEUDO_H_gamma.dat

@@ -2,12 +2,12 @@
 # energy
 # H gamma pseudo filter
 4283.4 0.0
-4283.5 -0.11268875366857142
-4319.74 -0.11268875366857142
-4319.75 0.22857142857142856
-4363.5 0.22857142857142856
+4283.5 0.11268875366857142
+4319.74 0.11268875366857142
+4319.75 -0.22857142857142856
+4363.5 -0.22857142857142856
 4363.6 0.0
 4367.200000000001 0.0
-4367.25 -0.11268875366857142
-4419.75 -0.11268875366857142
+4367.25 0.11268875366857142
+4419.75 0.11268875366857142
 4419.8 0.0

database_builder/filters/PSEUDO_Mg2.dat

@@ -2,14 +2,14 @@
 # energy
 # Mg2 pseudo filter
 4895.12 0.0
-4895.125 -0.07843137254117646
-4957.625 -0.07843137254117646
+4895.125 0.07843137254117646
+4957.625 0.07843137254117646
 4957.63 0.0
 5154.120000000001 0.0
-5154.125 0.23529411764705882
-5196.625 0.23529411764705882
+5154.125 -0.23529411764705882
+5196.625 -0.23529411764705882
 5196.63 0.0
 5301.12 0.0
-5301.125 -0.07843137254117646
-5366.125 -0.07843137254117646
+5301.125 0.07843137254117646
+5366.125 0.07843137254117646
 5366.130000000001 0.0