[eclipse] Add the SRE in the classpath when not specified.

see #233

Signed-off-by: Stéphane Galland <galland@arakhne.org>

plugins/io.sarl.eclipse/src/io/sarl/eclipse/SARLConfig.java

@@ -70,6 +70,11 @@ public final class SARLConfig {
 	 */
 	public static final String XTEXT_NATURE_ID = "org.eclipse.xtext.ui.shared.xtextNature"; //$NON-NLS-1$
 
+	/**
+	 * ID of the project nature defined by Maven.
+	 */
+	public static final String MAVEN_NATURE_ID = "org.eclipse.m2e.core.maven2Nature"; //$NON-NLS-1$
+
 	/**
 	 * ID of this nature.
 	 */

plugins/io.sarl.eclipse/src/io/sarl/eclipse/launching/Messages.java

@@ -34,6 +34,8 @@
 public class Messages extends NLS {
 	private static final String BUNDLE_NAME = "io.sarl.eclipse.launching.messages"; //$NON-NLS-1$
 	public static String AgentTypeSearchEngine_0;
+	public static String JavaLocalApplicationLaunchConfigurationDelegate_Creating_source_locator____2;
+	public static String JavaLocalApplicationLaunchConfigurationDelegate_Verifying_launch_attributes____1;
 	public static String MainLaunchConfigurationTab_0;
 	public static String MainLaunchConfigurationTab_1;
 	public static String MainLaunchConfigurationTab_2;
@@ -53,6 +55,11 @@ public class Messages extends NLS {
 	public static String RuntimeEnvironmentTab_7;
 	public static String SARLLaunchConfigurationDelegate_0;
 	public static String SARLLaunchConfigurationDelegate_1;
+	public static String SARLLaunchConfigurationDelegate_2;
+	public static String SARLLaunchConfigurationDelegate_3;
+	public static String SARLLaunchConfigurationDelegate_4;
+	public static String SARLLaunchConfigurationDelegate_5;
+	public static String SARLLaunchConfigurationDelegate_6;
 	static {
 		// initialize resource bundle
 		NLS.initializeMessages(BUNDLE_NAME, Messages.class);