Upload of attachments to a test result

	This allows to attach ANY Spring resource (for example the one created above but not only, since it can also be classpath: or osgibundle: Resources or ANY file on the file system where the agent is running (e.g. Mx *.mxres files on a server...))
	
	In order to use it:
	
	[[1]] First reference an attachment uploader service via OSGi (it is provided by the standard agent):
	
+-------------------------------+
<reference id="attachmentUploader" interface="org.argeo.slc.core.attachment.AttachmentUploader" />
+-------------------------------+
	
	[[1]] Then use an UploadAttachment task:
	
+-------------------------------+
<bean parent="task.uploadAttachments">
    <property name="attachmentUploader" ref="attachmentUploader" />
    <property name="attachment">
        <bean parent="taskArg.attachment">
            <property name="name" value="myAttachment.txt" />
        </bean>
    </property>
    <property name="resource" ref="basic.writeTo" />
    <property name="attachTo">
        <list>
            <ref bean="basic.testResult" />
        </list>
    </property>
</bean>
+-------------------------------+
	
	You have to specify an Attachment object with at least a 'name', you can also specify a 'contentType', but the server will recognize common extension of the name.
	You have to specify a (Spring) Resource, for example the one that you created before (the name of the attachment doesn't have to be the name of the file).
	Just doing this will already upload a file to the server, but if you want to access it you need to bind it to some object, typically a TreeTestResult. You can provide a list of AttachmentEnabled objects (only TreeTestResult implements it so far).
	
	You could use directly Spring Resource URL, e.g.:
	
+-------------------------------+
<property name="resource" value="osgibundle:/conf/main.xml" />
+-------------------------------+
	 
	You can also upload and attach many attachments in one shot. In that case provide a Map with the keys being Attachment objects and the values Resource objects. E.g.:
	
+-------------------------------+
<bean parent="task.uploadAttachments">
    <property name="attachmentUploader" ref="attachmentUploader" />
    <property name="attachments">
        <map>
            <entry>
                <key>
                    <bean parent="taskArg.attachment">
                        <property name="name" value="Reached.csv" />
                    </bean>
                </key>
                <bean factory-bean="fileDiff.testData" factory-method="getReached"
                    scope="execution">
                    <aop:scoped-proxy />
                </bean>
            </entry>
            <entry>
                <key>
                    <bean parent="taskArg.attachment">
                        <property name="name" value="Expected.csv" />
                    </bean>
                </key>
                <bean factory-bean="fileDiff.testData" factory-method="getExpected"
                    scope="execution">
                    <aop:scoped-proxy />
                </bean>
            </entry>
        </map>
    </property>
    <property name="attachTo">
        <list>
            <ref bean="fileDiff.testResult" />
        </list>
    </property>
</bean>
+-------------------------------+
	
	Retrieving the resources from this bean:
	
+-------------------------------+
<bean id="fileDiff.testData" parent="testData.reachedExpected"
    scope="execution">
    <aop:scoped-proxy />
    <property name="expected" value="osgibundle:/inputs/csvdiff/@{fileName}.csv" />
    <property name="reached"
        value="osgibundle:/inputs/csvdiff/@{fileName}_mod.csv" />
</bean>
+-------------------------------+
	
	[[1]] You can access the attachments from the Web UI by selecting a result in the list in the results perspective.
	You will see that a new button 'Attachment' in the toolbar get activated (if there are any attachments).