API Changed DMSDocument getters to be closer to existing File API

Reduces friction when migration from File records (which will be fairly common)

code/DMSDocument.php

@@ -236,7 +236,7 @@ class DMSDocument extends DataObject implements DMSDocumentInterface {
 	 * Returns a link to download this document from the DMS store
 	 * @return String
 	 */
-	function getDownloadLink() {
+	function getLink() {
 		return Controller::join_links(Director::baseURL(),'dmsdocument/'.$this->ID);
 	}
 
@@ -624,14 +624,19 @@ class DMSDocument extends DataObject implements DMSDocumentInterface {
 	/**
 	 * Return the extension of the file associated with the document
 	 */
-	function getFileExt() {
+	function getExtension() {
 		return strtolower(pathinfo($this->Filename, PATHINFO_EXTENSION));
 	}
+
+	function getSize() {
+		$size = $this->getAbsoluteSize();
+		return ($size) ? File::format_size($size) : false;
+	}
 	
 	/**
 	 * Return the size of the file associated with the document
 	 */
-	function getFileSize() {
+	function getAbsoluteSize() {
 		return filesize($this->getFullPath());
 	}
 	

code/interface/DMSDocumentInterface.php

@@ -130,17 +130,26 @@ interface DMSDocumentInterface {
 	 * @abstract
 	 * @return String
 	 */
-	function getDownloadLink();
+	function getLink();
 	
 	/**
 	 * Return the extension of the file associated with the document
 	 */
-	function getFileExt();
+	function getExtension();
 	
 	/**
-	 * Return the size of the file associated with the document
+	 * Returns the size of the file type in an appropriate format.
+	 *
+	 * @return string
 	 */
-	function getFileSize();
+	function getSize();
+
+	/**
+	 * Return the size of the file associated with the document, in bytes.
+	 *
+	 * @return int
+	 */
+	function getAbsoluteSize();
 	
 
 	/**