Attempt to not have CondaPkg and specify channel instead

Author: hwpang

CondaPkg.toml

@@ -2,20 +2,19 @@ using CondaPkg
 using PythonCall
 packages = keys(CondaPkg.current_packages())
 if !("rmg" in packages) && !("rmgmolecule" in packages)
-    ENV["JULIA_CONDAPKG_ENV"] = abspath("../rms_env")
     CondaPkg.add("rmgmolecule"; version=">=0.3.0", channel="mjohnson541")
 end
 if !(v"3.7" <= PythonCall.C.python_version() && PythonCall.C.python_version() <= v"3.9")
     CondaPkg.add("python"; version="3.9")
 end
 if !("matplotlib" in packages)
-    CondaPkg.add("matplotlib")
+    CondaPkg.add("matplotlib"; channel="conda-forge")
 end
 if !("rdkit" in packages)
-    CondaPkg.add("rdkit")
+    CondaPkg.add("rdkit"; channel="conda-forge")
 end
 if !("pydot" in packages)
-    CondaPkg.add("pydot")
+    CondaPkg.add("pydot"; channel="anaconda")
 end
 const Pkg = Base.require(Base.PkgId(Base.UUID("44cfe95a-1eb2-52ea-b672-e2afdf69b78f"), "Pkg"))
 Pkg.build("PythonCall")