Add warnings about experimental nature of this branch

Replace "jessie" with "stretch" in scripts.

README

@@ -1,6 +1,12 @@
 This is a collection of files intended to install
 a close approximation of BunsenLabs Linux
 on a basic command-line-only Debian Stretch system.
+
+**NOTE**
+This is an EXPERIMENTAL script, intended for developers and testers
+to investigate problems with migrating BunsenLabs from Debian Jessie to Stretch.
+DO NOT USE IT for systems where breakage would be a problem!
+
 For now, it will use the "bunsen-hydrogen" suite from
 the BunsenLabs Apt repository ( http://pkg.bunsenlabs.org/debian )
 to install BunsenLabs packages, 

gen_sources

@@ -1,2 +1,2 @@
-sed -r 's/(^\s*deb(-src)?\s+[^ ]+)(\s+jessie\s+|\s+jessie-updates\s+|\s+jessie\/updates\s+|\s+jessie-backports\s+).*$/\1\3 main contrib non-free/g
+sed -r 's/(^\s*deb(-src)?\s+[^ ]+)(\s+stretch\s+|\s+stretch-updates\s+|\s+stretch\/updates\s+|\s+stretch-backports\s+).*$/\1\3 main contrib non-free/g
 /deb-src/s/^/#/' /etc/apt/sources.list  2> >( tee -a "$logfile" ) > sysfiles1/etc/apt/sources.list || giveup "There was a problem editing sources.list." 1

greeting

@@ -1,8 +1,11 @@
-This is a network installer for BunsenLabs Linux.
+This is an EXPERIMENTAL network installer for
+BunsenLabs Linux on Debian Stretch.
+
 It will use the BunsenLabs Apt repository
 to download and install necessary packages,
 along with packages from the Debian repositories,
 and do any other necessary configuration.
 
-While there is a good chance of installing a working system,
-please be ready to deal with any bugs that show up!
+As this is intended only for development and testing at the moment,
+do not use this "helium-dev" version of the installer for
+any systems where breakage would be a problem!

install

@@ -154,7 +154,7 @@ echo "
 $( < greeting )
 
 This script is expected to be run just after completing a netinstall
-installation of the Debian Jessie CORE SYSTEM ONLY.
+installation of the Debian Stretch CORE SYSTEM ONLY.
 (See \"Debian Netinstall Hints\" in the README file.)
 "
 confirm "Would you like to start the install now?" 0
@@ -183,8 +183,8 @@ bigmsg "Messages are being saved to $logfile"
 cp -f pkgs-recs pkgs-norecs config "$log_dir"
 
 # check debian version FIXME Is /etc/debian_version the best way?
-grep -q '\(jessie\|\(^\|[^a-zA-Z0-9.]\)8\($\|[^a-zA-Z0-9]\)\)' /etc/debian_version && msg "Debian version: OK"|| { warnlog "/etc/debian_version reads: $(cat /etc/debian_version)"
-    confirm "You do not appear to have Debian Jessie installed.
+grep -q '\(stretch\|\(^\|[^a-zA-Z0-9.]\)9\($\|[^a-zA-Z0-9]\)\)' /etc/debian_version && msg "Debian version: OK"|| { warnlog "/etc/debian_version reads: $(cat /etc/debian_version)"
+    confirm "You do not appear to have Debian Stretch installed.
 If you think this is incorrect,
 you may wish to continue with the installation,
 otherwise it would be safer to stop.