Add an Eclipse-specific profile to help with annotation processing

Eclipse does not execute annotation processors as part of the build, in
particular not as part of the incremental build. However, scijava-common's
annotation processor is quite able to run as part of the incremental
build.

Let's use pom-scijava to auto-activate the newly introduced goal of the
scijava-maven-plugin to beat Eclipse into submission, so that we can work
around Eclipse's failure to abide by the Java specification (that
*mandates* running all annotation processors available on the class path
*unless* turned off explicitly).

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

pom.xml

@@ -1188,6 +1188,33 @@ Projects wishing to use pom-scijava as a parent project need to override the &lt
 				</repository>
 			</distributionManagement>
 		</profile>
+
+		<!-- This profile helps Eclipse parse SciJava annotations of imported projects. -->
+		<profile>
+			<id>only-eclipse</id>
+			<activation>
+				<property>
+					<name>m2e.version</name>
+				</property>
+			</activation>
+			<build>
+				<plugins>
+					<plugin>
+						<groupId>org.scijava</groupId>
+						<artifactId>scijava-maven-plugin</artifactId>
+						<version>${scijava-maven-plugin.version}</version>
+						<executions>
+							<execution>
+								<goals>
+									<goal>eclipse-helper</goal>
+								</goals>
+								<phase>process-classes</phase>
+							</execution>
+						</executions>
+					</plugin>
+				</plugins>
+			</build>
+		</profile>
 	</profiles>
 
 </project>