Add methods Reactor::setChemistry and chemistryEnabled

These functions mirror the setEnergy and energyEnabled methods.
The enableChemistry and disableChemistry methods are deprecated.

include/cantera/zeroD/Reactor.h

@@ -55,13 +55,29 @@ public:
     void setKineticsMgr(Kinetics& kin);
 
     //! Disable changes in reactor composition due to chemical reactions.
+    //! @deprecated Use setChemistry instead. To be removed after Cantera 2.3
     void disableChemistry() {
-        m_chem = false;
+        warn_deprecated("Reactor::disableChemistry",
+            "Use setChemistry instead. To be removed after Cantera 2.3");
+        setChemistry(false);
     }
 
     //! Enable changes in reactor composition due to chemical reactions.
+    //! @deprecated Use setChemistry instead. To be removed after Cantera 2.3
     void enableChemistry() {
-        m_chem = true;
+        warn_deprecated("Reactor::enableChemistry",
+            "Use setChemistry instead. To be removed after Cantera 2.3");
+        setChemistry(true);
+    }
+
+    //! Enable or disable changes in reactor composition due to chemical reactions.
+    void setChemistry(bool cflag = true) {
+        m_chem = cflag;
+    }
+
+    //! Returns `true` if changes in the reactor composition due to chemical reactions are enabled.
+    bool chemistryEnabled() const {
+        return m_chem;
     }
 
     //! Set the energy equation on or off.

src/zeroD/Reactor.cpp

@@ -29,9 +29,9 @@ void Reactor::setKineticsMgr(Kinetics& kin)
 {
     m_kin = &kin;
     if (m_kin->nReactions() == 0) {
-        disableChemistry();
+        setChemistry(false);
     } else {
-        enableChemistry();
+        setChemistry(true);
     }
 }