[ci skip] update inlist script to backup the inlists before changing them

Author: evbauer

docs/source/changelog.rst

@@ -50,6 +50,9 @@ to update all inlist files (``inlist*``), which you can run in any work director
 where you want to update every inlist by invoking ::
   $MESA_DIR/scripts/update_inlists
 
+This script will save the previous versions of your inlists to a directory named
+``backup_inlists``.
+  
 Renamed controls for upper limits
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 

scripts/update_inlists

@@ -1,5 +1,7 @@
 #!/bin/bash
 
+mkdir backup_inlists
+cp inlist* backup_inlists
 sed 's/log_center_density_limit/log_center_density_upper_limit/' -i inlist*
 sed 's/log_center_temp_limit/log_center_temp_upper_limit/' -i inlist*
 sed 's/center_entropy_limit/center_entropy_upper_limit/' -i inlist*