IndexController: de-privatize the index-stopping stuff

We shouldn't need to do this, but we still need to, because
our index operations are split between two different controllers,
which is a bit odd.

Author: pieter

PBGitIndexController.h

@@ -36,5 +36,8 @@
 - (NSString *) stagedChangesForFile:(PBChangedFile *)file;
 - (NSString *) unstagedChangesForFile:(PBChangedFile *)file;
 
+- (void)stopTrackingIndex;
+- (void)resumeTrackingIndex;
+
 - (NSMenu *) menuForTable:(NSTableView *)table;
 @end

PBGitIndexController.m

@@ -12,11 +12,6 @@
 
 #define FileChangesTableViewType @"GitFileChangedType"
 
-@interface PBGitIndexController (PrivateMethods)
-- (void)stopTrackingIndex;
-- (void)resumeTrackingIndex;
-@end
-
 @implementation PBGitIndexController
 
 @synthesize contextSize;