remove LDA_X from ob86, evx and b86r

parser/parser-quantum-espresso/QuantumEspressoXC.py

@@ -715,6 +715,9 @@ EXCHANGE_GRADIENT_CORRECTION = [
         'xc_terms': [{
             'XC_functional_name': "x_qe_GGA_X_OPTB86_VDW",
         }],
+        'xc_terms_subtract': [{
+            'XC_functional_name': 'LDA_X',
+        }],
         'xc_section_method': {
             'x_qe_xc_igcx_name':       "ob86",
             'x_qe_xc_igcx_comment':    "optB86b exchange",
@@ -725,6 +728,9 @@ EXCHANGE_GRADIENT_CORRECTION = [
         'xc_terms': [{
             'XC_functional_name': "GGA_X_EV93",
         }],
+        'xc_terms_subtract': [{
+            'XC_functional_name': 'LDA_X',
+        }],
         'xc_section_method': {
             'x_qe_xc_igcx_name':       "evx",
             'x_qe_xc_igcx_comment':    "Engel-Vosko exchange",
@@ -735,6 +741,9 @@ EXCHANGE_GRADIENT_CORRECTION = [
         'xc_terms': [{
             'XC_functional_name': "GGA_X_B86_R",
         }],
+        'xc_terms_subtract': [{
+            'XC_functional_name': 'LDA_X',
+        }],
         'xc_section_method': {
             'x_qe_xc_igcx_name':       "b86r",
             'x_qe_xc_igcx_comment':    "revised Becke (b86b)",

test/xc_functionals/refactor_test/testuite-xc.ref.log

@@ -300,9 +300,6 @@ qe_xc: 0.00 VDW-DF-OB86 ( 1  4 24  0 1 0)
   {
     "XC_functional_name": "LDA_C_PW"
   },
-  {
-    "XC_functional_name": "LDA_X"
-  },
   {
     "XC_functional_name": "x_qe_GGA_X_OPTB86_VDW"
   },
@@ -423,9 +420,6 @@ qe_xc: 0.00 EV93 ( 1  4 25  0 0 0)
   },
   {
     "XC_functional_name": "LDA_C_PW"
-  },
-  {
-    "XC_functional_name": "LDA_X"
   }
 ]
 qe_xc: 0.00 SOGGA ( 1  4 17  4 0 0)