API CHANGE

Add a new field in the output args for the sysadm/updates check for updates:
"last_check":"<ISO date/time stamp>"

This returns the timestamp the last time a "full" check was performed (since some checks are flagged as quick/automatic and just re-use the previous check unless a significant amount of time has passed first - 12 hours is what it is set to right now).

src/server/library/sysadm-update.cpp

@@ -59,6 +59,7 @@ QJsonObject Update::checkUpdates(bool fast) {
     General::writeTextFile(UP_UPFILE, output); //save this check for later "fast" updates
   }
   //qDebug() << "pc-updatemanager checks:" << output;
+  
   QString nameval;
   int pnum=1;
   for ( int i = 0; i < output.size(); i++)
@@ -106,6 +107,7 @@ QJsonObject Update::checkUpdates(bool fast) {
     // Update status that we have updates
     retObject.insert("status", "updatesavailable");
   }
+  retObject.insert("last_check",QFileInfo(UP_UPFILE).lastModified().toString(Qt::ISODate) );
   return retObject;
 }
 
@@ -276,4 +278,3 @@ QJsonObject Update::writeSettings(QJsonObject obj){
   }
   return ret;
 }
-