Update install_and_test.md

install_and_test.md

@@ -14,8 +14,15 @@ pip install 'hotwheels_PM[tested] @ git+ssh://git@git.ia2.inaf.it/hotwheels/PM.g
 This will install also the following hotwheels packages: core, io, timestep. 
 The `[tested]` tag will install the versions of the dependencies used to test the release (`v0.0.0alpha` in this case).
 
+# Run tests
+
+To run the C and python tests of the installed `hotwheels` components, run: 
+
+```bash
+python -m hotwheels.checkup hotwheels
+```
 
-# Install custom release versions
+# Install custom versions
 
 In case you want to run the module with other `hotwheel` component version you can install each manually:
 
@@ -58,13 +65,6 @@ If you want to also create a multi-windows tmux session where each panel corresp
 You can insert a personalised number of repos by running for instance `cloneall.bash [..] -r core octree` (will only download core and octree module).
 
 
-# Run tests
-
-To run the C and python tests of the installed `hotwheels` components, run: 
-
-```bash
-python -m hotwheels.checkup hotwheels
-```
 
 # Environment variables