[core] Remove potential leftover paths from previous ROOT versions

Remove within thisroot.(c)sh potential leftover paths from previous ROOT versions

Author: ferdymercury

config/thisroot.csh

@@ -168,6 +168,14 @@ if ($?old_rootsys) then
                                  -e "s;^$old_rootsys/etc/notebook:;;g"   \
                                  -e "s;^$old_rootsys/etc/notebook${DOLLAR};;g"`
    endif
+   # Potential leftovers from ROOT < v6.36
+   if ($?JUPYTER_CONFIG_DIR) then
+      setenv JUPYTER_CONFIG_DIR `set DOLLAR='$'; echo $JUPYTER_CONFIG_DIR | \
+                             sed -e "s;:$old_rootsys/etc/notebook:;:;g" \
+                                 -e "s;:$old_rootsys/etc/notebook${DOLLAR};;g"   \
+                                 -e "s;^$old_rootsys/etc/notebook:;;g"   \
+                                 -e "s;^$old_rootsys/etc/notebook${DOLLAR};;g"`
+   endif
 
    if ($?ROOT_INCLUDE_PATH) then
       setenv ROOT_INCLUDE_PATH `set DOLLAR='$'; echo $ROOT_INCLUDE_PATH | \

config/thisroot.sh

@@ -78,6 +78,11 @@ clean_environment()
          drop_from_path "$JUPYTER_CONFIG_PATH" "${old_rootsys}/etc/notebook"
          JUPYTER_CONFIG_PATH=$newpath
       fi
+      # Potential leftovers from ROOT < v6.36
+      if [ -n "${JUPYTER_CONFIG_DIR-}" ]; then
+         drop_from_path "$JUPYTER_CONFIG_DIR" "${old_rootsys}/etc/notebook"
+         JUPYTER_CONFIG_DIR=$newpath
+      fi
    fi
    if [ -z "${MANPATH-}" ]; then
       # Grab the default man path before setting the path to avoid duplicates