UPGRADING-NC.md - draft version

UPGRADING-NC.md

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+DRAFT!
+
+upgrade one major version at a time
+
+
+check that the version of postgresql is adequate for the target version before upgrading
+
+if it isn't, upgrade it:
+
+dump the data
+move the volume aside
+recreate the volume
+upgrade
+start
+re-import
+delete the old volume
+
+copy over the pg_hba.conf, otherwise the auth credentials won't be used correctly (need: 
+host all all all md5)