Update mass linearise script to import mrl via nlmaps_tools

linearise_all.sh

@@ -4,5 +4,5 @@ find . -name '*.mrl' |
     while read -r mrlfile; do
         linfile="${mrlfile%mrl}lin"
         echo "$mrlfile -> $linfile"
-        python -m mrl.linearise -i "$mrlfile" -o "$linfile"
+        python -m nlmaps_tools.mrl.linearise -i "$mrlfile" -o "$linfile"
     done