Bug 214204 Only document content in document folder should be removed.[0601]
Description: Only document related content in document folder should be removed. Build number:2.3.0.v20080103 Steps to reproduce: 1. Deploy BIRT. 2. Edit web.xml to set BIRT_VIEWER_DOCUMENT_FOLDER to your local path and there are content inside the path. 3. Start server and click View Example to preview sample report. Expected result: Only content created by viewer should be removed in specified document folder. Actual result: All contents are deleted despite whether they are related with BIRT. Error log:n/a
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/utility/ParameterAccessor.java
* Parameter name that gives the selected column names of the export data
	 * form.
	 */
	public static final String PARAM_SELECTEDCOLUMN = "SelectedColumn"; 
	/**
	 * Context parameter name that gives the default locale of the BIRT viewer.
	 */
	public static final String INIT_PARAM_LOCALE = "BIRT_VIEWER_LOCALE"; 
	/**
	 * Context parameter name that gives the working folder of the local BIRT
	 * viewer user.
	 */
	public static final String INIT_PARAM_WORKING_DIR = "BIRT_VIEWER_WORKING_FOLDER"; 
	/**
	 * Context parameter name that gives the repository location of the image
	 * files.
	 */
	public static final String INIT_PARAM_IMAGE_DIR = "BIRT_VIEWER_IMAGE_DIR"; 
	/**
	 * Context parameter name that gives the repository location of the logging
	 * files.
	 */
	public static final String INIT_PARAM_LOG_DIR = "BIRT_VIEWER_LOG_DIR"; 
	/**
	 * Context parameter name that gives the logging level.
	 */
	public static final String INIT_PARAM_LOG_LEVEL = "BIRT_VIEWER_LOG_LEVEL"; 
	/**
	 * Context parameter name that gives the repository location of the script
	 * files to run reports.