move error pages to error subfolder

bwreg-webapp/src/main/java/edu/kit/scc/webreg/sec/SecurityFilter.java

@@ -104,7 +104,7 @@ public class SecurityFilter implements Filter {
 			path.startsWith("/Shibboleth.sso/") ||
 			path.startsWith("/saml/") ||
 			path.startsWith("/logout/") ||
-			path.startsWith("/error") ||
+			path.startsWith("/error/") ||
 			path.equals("/favicon.ico")
 				) {
 			chain.doFilter(servletRequest, servletResponse);

bwreg-webapp/src/main/webapp/WEB-INF/web.xml

@@ -67,17 +67,17 @@
         <param-value>${bwreg.theme}</param-value>
 	</context-param>
 
-    <error-page>
-        <error-code>500</error-code>
-        <location>/error.xhtml</location>
-    </error-page>
     <error-page>
         <exception-type>edu.kit.scc.webreg.exc.SamlAuthenticationException</exception-type>
-        <location>/error-saml.xhtml</location>
+        <location>/error/error-saml.xhtml</location>
     </error-page>
     <error-page>
         <exception-type>java.lang.Exception</exception-type>
-        <location>/error.xhtml</location>
+        <location>/error/error.xhtml</location>
+    </error-page>
+    <error-page>
+        <error-code>500</error-code>
+        <location>/error/error.xhtml</location>
     </error-page>
     
     <distributable/>