Porting fixes from SourceWebSVN to SourceSFSVN

This follows discussion on dregad@deba255#commitcomment-2713308

Changesets deba255 and
c11a010 for SourceWebSVN apply mutatis
mutandis to SourceSFSVN.

Fixes #52

SourceSFSVN/SourceSFSVN.php

@@ -48,15 +48,17 @@ public function url_changeset( $p_repo, $p_changeset ) {
 	}
 
 	public function url_file( $p_repo, $p_changeset, $p_file ) {
-		if ( $p_file->action == 'D' ) {
-			return '';
-		}
+		# if the file has been removed, it doesn't exist in current revision
+		# so we generate a link to (current revision - 1)
+		$t_revision = ($p_file->action == 'rm')
+					? $p_changeset->revision - 1
+					: $p_changeset->revision;
 		return $this->sf_url( $p_repo ) . urlencode( $p_file->filename ) .
-			'?view=markup&pathrev=' . urlencode( $p_changeset->revision );
+			'?view=markup&pathrev=' . urlencode( $t_revision );
 	}
 
 	public function url_diff( $p_repo, $p_changeset, $p_file ) {
-		if ( $p_file->action == 'D' || $p_file->action == 'A' ) {
+		if ( $p_file->action == 'rm' || $p_file->action == 'add' ) {
 			return '';
 		}
 		$t_diff = '?r1=' . urlencode( $p_changeset->revision ) . '&r2=' . urlencode( $p_changeset->revision - 1 );