Enable downgrades to old firmware versions

src/js/app.js

@@ -112,7 +112,8 @@ module.exports = new Vue({
       config: {
         settings: {units: 'METRIC'},
         motors: [{}, {}, {}, {}],
-        version: '<loading>'
+        version: '<loading>',
+        full_version: '<loading>'
       },
       state: {
         messages: [],

src/pug/index.pug

@@ -109,7 +109,7 @@ html(lang="en")
                   title="Raspberry Pi temperature too high.")
               .subtitle
                 | CNC Controller #[b {{state.demo ? 'Demo ' : ''}}]
-                | v{{config.version}}
+                | v{{config.full_version}}
                 a.upgrade-version(v-if="show_upgrade()", href="#admin-general")
                   | Upgrade to v{{latestVersion}}
                 .fa.fa-check(v-if="!show_upgrade() && latestVersion",

src/py/bbctrl/Config.py

@@ -161,8 +161,8 @@ class Config(object):
                     motor['max-jerk'] = 1000
                     motor['zero-backoff'] = 1
 
-        config['version'] = self.version
-
+        config['version'] = self.version.split('b')[0]
+        config['full_version'] = self.version
 
     def save(self, config):
         self.upgrade(config)