WIP add flag to binding models to switch between pH and proton concentration

Add the ###_USE_PROTON_CONCENTRATION flag, which if True sets component 1 to proton concentration and if False sets component 1 to pH (= -log10(proton concentration)).

For the colloidal binding, which can be used with or without pH effects entirely:
Rename the COL_USE_PH flag to COL_INCLUDE_PH, which if True treats component 1 as either pH or proton concentration and if False treats component 1 as a regular component.

Author: ronald-jaepel

src/libcadet/model/binding/ColloidalBinding.cpp

@@ -51,7 +51,8 @@
 	"constantParameters":
 		[
 			{ "type": "ScalarParameter", "varName": "linThreshold", "confName": "COL_LINEAR_THRESHOLD"},
-			{ "type": "ScalarBoolParameter", "varName": "usePh", "confName": "COL_USE_PH"}
+			{ "type": "ScalarBoolParameter", "varName": "includePh", "confName": "COL_INCLUDE_PH"},
+			{ "type": "ScalarBoolParameter", "varName": "useProtonConcentration", "confName": "COL_USE_PROTON_CONCENTRATION"}
 		]
 }
 </codegen>*/
@@ -63,6 +64,8 @@
  qMax = Capacity
 */
 
+// TODO: Actually use useProtonConcentration parameter
+
 namespace cadet
 {
 
@@ -180,10 +183,10 @@ class ColloidalBindingBase : public ParamHandlerBindingModelBase<ParamHandler_t>
 		if (_nBoundStates[0] != 0)
 			throw InvalidParameterException("Salt component (index 0) must be non-binding (NBOUND = 0)");
 
-		if (_paramHandler.usePh().get() && (_nComp <= 2))
+		if (_paramHandler.includePh().get() && (_nComp <= 2))
 			throw InvalidParameterException("No protein component present (existing two components are salt and PH)");
 
-		if (_paramHandler.usePh().get())
+		if (_paramHandler.includePh().get())
 		{
 			_startIdx = 2;
 			if (_nBoundStates[1] != 0)

src/libcadet/model/binding/GeneralizedIonExchangeBinding.cpp

@@ -50,7 +50,8 @@
 	"constantParameters":
 		[
 			{ "type": "ReferenceConcentrationParameter", "varName": ["refC0", "refQ"], "objName": "refConcentration", "confPrefix": "GIEX_"},
-			{ "type": "ReferenceConcentrationParameter", "varName": ["refPhC0", "refPhQ"], "objName": "refConcentrationPh", "confPrefix": "GIEX_PH", "skipConfig": true}
+			{ "type": "ReferenceConcentrationParameter", "varName": ["refPhC0", "refPhQ"], "objName": "refConcentrationPh", "confPrefix": "GIEX_PH", "skipConfig": true},
+			{ "type": "ScalarBoolParameter", "varName": "useProtonConcentration", "confName": "GIEX_USE_PROTON_CONCENTRATION"}
 		]
 }
 </codegen>*/
@@ -66,6 +67,8 @@
  refPhC0,refPhQ = Reference concentrations for pH dependent powers
 */
 
+// TODO: Actually use useProtonConcentration parameter
+
 namespace cadet
 {