private String getFolderAndCreateIfMissing(String inFolder) {
		String folder = outputFolder;
		if (inFolder != null) {
			folder += "/" + inFolder;
		}
		mkdirs(folder);
		return folder;
	}
private String getFolderAndCreateIfMissing ( String inFolder ) { String folder = outputFolder ; if ( inFolder != null ) { folder += "/" + inFolder ; } mkdirs ( folder ) ; return folder ; }
Computes foldername and creates the folders that does not already exist

@param inFolder, left out if null
@return