Update developer instructions for Julia and RMS steps.

Users need to run install_rms.sh then follow its instructions
then run it again.

Also made a one-liner test that RMS is installed
(though carefully avoid the many minutes of pre-compiling)

Author: rwest

documentation/source/users/rmg/installation/anacondaDeveloper.rst

@@ -102,14 +102,19 @@ Installation by Source Using Anaconda Environment for Unix-based Systems: Linux
 
    Be sure to either close and reopen your terminal to refresh your environment variables (``source ~/.bashrc`` or ``source ~/.zshrc``).
 
-#. **Optional (Recommended)**: Install and Link Julia dependencies using ``install_rms.sh``. Ensure that you have modified your environment variables as described above, and then run the following: ::
+#. **Optional (Recommended)**: Install and Link Julia dependencies.
+
+    Installing Julia and ReactionMechanismSimulator.jl (RMS) will enable all the features in RMG that require RMS-based reactors,
+    as well as using ``method='ode'`` when solving the Master Equation with Arkane.
+    Note that installing RMS can cause errors when running Cantera simulations; this should not affect normal RMG use, but if you wish to run Cantera simulations you will need to maintain a separate conda environment without RMS in it.
+
+    Ensure that you have modified your environment variables as described above, and then run the following: ::
 
      source install_rms.sh
 
-    Follow the final set of instructions from this installation script with regard to setting additional environment variables.
-    Installing RMS will allow using ``method='ode'`` when solving the Master Equation with Arkane and using ``ReactionMechanismSimulator.jl``-based reactors in RMG.
-    Note that installing RMS will cause errors when running Cantera simulations.
-    This should not affect normal RMG use, but if you wish to run Cantera simulations you will need to maintain a separate ``rmg_env`` without RMS in it.
+    Follow the instructions that it provides for installing Julia and Juliaup,
+    which can involve several steps including restarting your terminal or shell.
+    Run the script again, until it finishes installing RMS and all of its dependencies, and reports that ReactionMechanismSimulator is installed.
 
 #. Finally, you can run RMG from any location by typing the following (given that you have prepared the input file as ``input.py`` in the current folder). ::
 

install_rms.sh

@@ -54,3 +54,5 @@ conda activate $current_env
 conda install -y conda-forge::pyjuliacall
 
 julia -e 'using Pkg; Pkg.add(Pkg.PackageSpec(name="ReactionMechanismSimulator", url="https://github.com/hwpang/ReactionMechanismSimulator.jl.git", rev="fix_installation")); using ReactionMechanismSimulator; Pkg.instantiate()' || echo "RMS install error - continuing anyway ¯\_(ツ)_/¯"
+
+python -c "from juliacall import Main; import sys; sys.exit(0 if Main.seval('Base.identify_package(\"ReactionMechanismSimulator\") !== nothing') and print('ReactionMechanismSimulator is installed in $current_env') is None else 1)"