Prepare charts moved from api server to here

route/api.js
   - new distriputer fpr chart preparation

appp.js
   - removed unnecessary calls

public/javascripts/map.js
   - changed /char/... call to /api/... call

charts/preparecharts
   - added

charts/utilities.js
   - added

public/javascripts/showcharts.js
   - changed /char/... call to /api/... call

routes/users.js
   - deleted

public/javascripts/showcharts.js

@@ -56,7 +56,7 @@ export async function showChart(params, typ, container) {
         }
     }
 
-    const url = `/chart/getsensordata?sensorid=${params.sid}&data=${typ}&span=${params.span}&datetime=${params.datetime.slice(0,-10)}&peak=${params.peak}`
+    const url = `/api/getsensordata?sensorid=${params.sid}&data=${typ}&span=${params.span}&datetime=${params.datetime.slice(0,-10)}&peak=${params.peak}`
     let ret = await fetch(url)
         .catch(e => {
             logerror(e)