Merge remote-tracking branch 'remotes/origin/master' into hechu1

# Conflicts:
#	src/core/process/C_TeacherSearchStudent.java
#	web/jsFile/upload_action.js

.idea/artifacts/gdms_war_exploded.xml

@@ -7,6 +7,9 @@
         <element id="directory" name="classes">
           <element id="module-output" name="gdms" />
         </element>
+        <element id="directory" name="lib">
+          <element id="file-copy" path="C:/Program Files/Apache Software Foundation/Tomcat 9.0/lib/tomcat-jdbc.jar" />
+        </element>
       </element>
     </root>
   </artifact>

.idea/misc.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_10" default="true" project-jdk-name="10" project-jdk-type="JavaSDK">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_10" default="false" project-jdk-name="11" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/out" />
   </component>
 </project>

.idea/vcs.xml

@@ -2,6 +2,5 @@
 <project version="4">
   <component name="VcsDirectoryMappings">
     <mapping directory="" vcs="Git" />
-    <mapping directory="$PROJECT_DIR$" vcs="Git" />
   </component>
 </project>