Remove production of sources.zip, ensure LICENSE and NOTICE in

sources.jar

An archive for sources can be downloaded
directly from Gitlab, in pages related to
tags or releases.
Uses the standard maven source plugin instead
of rebuilding it with assembly.

pom.xml

@@ -34,7 +34,6 @@
     <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
     <rugged.spotbugs-maven-plugin.version>4.0.4</rugged.spotbugs-maven-plugin.version>
     <rugged.jacoco-maven-plugin.version>0.8.5</rugged.jacoco-maven-plugin.version>
-    <rugged.maven-assembly-plugin.version>3.1.1</rugged.maven-assembly-plugin.version>
     <rugged.maven-bundle-plugin.version>4.2.1</rugged.maven-bundle-plugin.version>
     <rugged.maven-changes-plugin.version>2.12.1</rugged.maven-changes-plugin.version>
     <rugged.maven-checkstyle-plugin.version>3.1.1</rugged.maven-checkstyle-plugin.version>
@@ -196,17 +195,6 @@
           </archive>
         </configuration>
       </plugin>
-      <plugin>
-        <groupId>org.apache.maven.plugins</groupId>
-        <artifactId>maven-assembly-plugin</artifactId>
-        <version>${rugged.maven-assembly-plugin.version}</version>
-        <configuration>
-          <descriptors>
-            <descriptor>src/main/assembly/source-distribution-assembly.xml</descriptor>
-            <descriptor>src/main/assembly/source-jar-assembly.xml</descriptor>
-          </descriptors>
-        </configuration>
-      </plugin>
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-resources-plugin</artifactId>

src/main/assembly/source-distribution-assembly.xml

-<assembly>
-  <id>sources</id>
-  <formats>
-    <format>zip</format>
-  </formats>
-  <fileSets>
-    <fileSet>
-      <includes>
-       <include>README.txt</include>
-       <include>LICENSE.txt</include>
-       <include>NOTICE.txt</include>
-       <include>BUILDING.txt</include>
-       <include>pom.xml</include>
-       <include>checkstyle.xml</include>
-       <include>spotbugs-exclude-filter.xml</include>
-       <include>license-header.txt</include>
-      </includes>
-      <useDefaultExcludes>true</useDefaultExcludes>
-    </fileSet>
-    <fileSet>
-      <directory>src</directory>
-      <useDefaultExcludes>true</useDefaultExcludes>
-    </fileSet>
-  </fileSets>
-</assembly>

src/main/assembly/source-jar-assembly.xml

-<assembly>
-  <id>sources</id>
-  <formats>
-    <format>jar</format>
-  </formats>
-  <includeBaseDirectory>false</includeBaseDirectory>
-  <fileSets>
-    <fileSet>
-      <includes>
-       <include>LICENSE.txt</include>
-       <include>NOTICE.txt</include>
-      </includes>
-      <outputDirectory>META-INF</outputDirectory>
-    </fileSet>
-    <fileSet>
-      <directory>src/main/java</directory>
-      <outputDirectory>.</outputDirectory>
-      <includes>
-        <include>**/*.java</include>
-      </includes>
-      <useDefaultExcludes>true</useDefaultExcludes>
-    </fileSet>
-  </fileSets>
-</assembly>