NSBrowser cleanup

[Serg Stoyan]

Hi everybody,

Doing some fixes in NSBrowser I come up to idea that NSBrowser needs some 
reorganization. Let me explain what I mean.

NSBrowser.m has 3 classes NSBrowserColumn,  GSBrowserTitleCell and NSBrowser 
itself.
The idea is to sepearate classes location:
- NSBrowser stays in NSBroser.m
- NSBrowserColumn goes into AppKit/NSBrowserColumn.h  and 
Sources/NSBrowserColumn.m
- change GSBrowserTitleCell name to NSBrowserTitleCell and put into
  AppKit/NSBrowserTitleCell.h and Sources/NSBrowserTitleCell.m

Notice that NSBrowserTitleCell.h and NSBrowserColumn.h can be installable or 
not. I've 
also noticed that GSBrowserTitleCell is used by NSFontPanel so it should be 
modified too.
Is there any objections?

I've done some formatting inside NSBrowser.m also. The basic principles of this 
formatting are:

1. Methods are placed in order specified in OpenStep specification.

2. Methods are grouped by activity prepending with comments in the form:
//-------------
// Acttivity group description as described in OpenStep specification
//-------------

3. GNUstep additions should go in category with name "GNUstepAdditions". Example
@implementetaion NSBrowser (GNUstepAdditions)
// GNUstep specific methods go here
@end

4. Cocoa additions should go in category with name "CocoaAdditions" (there's no 
Cocoa 
  specific code in NSBrowser, although).

5. Private method names should be prepended with "_" and go into category with 
name 
"Private".

As a result it should make GNUstep code more maintainable and clean. Moreover, 
when 
documentation generated, we'll see GNUstep and Cocoa specific methods (if any) 
separated 
from OpenStep standard's methods. I think there are other classes that needs 
such cleanup.

What do everybody think about adding such formatting rules info "Coding Style" 
section of 
"Coding Standarts" document?

--
Serg Stoyan