Makefile construction cleanup

Update the help text in setup.sh.  When building with a hints file from TOP,
the path to the hints file should start from TOP (instead of "hints/foo").
Make the notes in the generated makefiles consistent as to case.

sys/unix/mkmkfile.sh

@@ -8,7 +8,8 @@
 #  $1 basefile
 #  $2 basefile tag
 #  $3 install path
-#  $4 hints file
+#  $4 hints file (path)
+#  $5 hints file (as given by user)
 
 echo "#" > $3
 echo "# This file is generated automatically.  Do not edit." >> $3
@@ -18,25 +19,25 @@ echo "MAKEFILE_$2=1" >> $3
 echo "" >> $3
 
 echo "###" >> $3
-echo "### Start $4 PRE" >> $3
+echo "### Start $5 PRE" >> $3
 echo "###" >> $3
 awk '/^#-PRE/,/^#-POST/{ \
 	if(index($0, "#-PRE") == 1) print "# (new segment at source line",NR,")"; \
 	if(index($0, "#-P") != 1) print}' $4 >> $3
-echo "### end $4 PRE" >> $3
+echo "### End $5 PRE" >> $3
 echo "" >> $3
 
 echo "###" >> $3
 echo "### Start $1" >> $3
 echo "###" >> $3
 cat $1 >> $3
-echo "### end of file" >> $3
+echo "### End $1" >> $3
 echo "" >> $3
 
 echo "###" >> $3
-echo "### Start $4 POST" >> $3
+echo "### Start $5 POST" >> $3
 echo "###" >> $3
 awk '/^#-POST/,/^#-PRE/{ \
 	if(index($0, "#-POST") == 1) print "# (new segment at source line",NR,")"; \
 	if(index($0, "#-P") != 1) print}' $4 >> $3
-echo "### end $4 POST" >> $3
+echo "### End $5 POST" >> $3