Make it easier to allow users to send/create patches for maven

Add something similar to maven.xml:

<goal name="maven:patch">
<property name="patch.package" value="patch.tar.gz"/>
<property name="patch.file" value="patch.txt"/>

<condition property="cvs.found">
<or>
<available file="cvs" filepath="$

{env.PATH}"/>
<available file="cvs.exe" filepath="${env.PATH}

"/>
<available file="cvs.exe" filepath="$

{env.Path}

"/>
</or>
</condition>

<target name="createpatch" if="cvs.found">
<cvs command="-q diff -u" output="$

{patch.file}"/>
</target>

<target name="newfiles" depends="createpatch">
<delete file="${patch.package}"/>
<cvs command="-q diff -N" output="${patch.file}

.tmp"/>
<replace file="$

{patch.file}.tmp" token="? " value=""/>
</target>

<target name="patchpackage" depends="newfiles">
<tar basedir="${basedir}"
tarfile="${patch.package}"
compression="gzip"
includesfile="${patch.file}

.tmp"
excludes="$

{patch.file}.tmp"/>
<delete file="${patch.file}

.tmp"/>
</target>
</goal>