Problem
-------
Forms is hardcoded to support absolute positioning. This will work
for the short-term; however, the request is constantly made for some
"better" (sic) layout management systems. We even have patches from
Madlocke that implement several layout engines. We don't, however,
want to clutter up the forms code or the forms GFParser with support
for all the different layout management styles.

Solution
--------
Remove ANY positioning logic from the basic Forms DTD and implement
all positioning using Layout Adapters, qualified by an XML namespace
(Grid, GridBox, Absolute, Box)

Advantages
----------
It removes positioning ugliness from the forms code and puts it in the
Layout Adapter code. It allows us to keep our current absolute
positioning that has worked so well. It makes other people happy without
requiring us to actually support them :)

Disadvantages
-------------
It does break existing forms.  However, code could be put in GFObjects
to implicitly convert hardcoded x,y attributes to namespace-qualified
x,y attributes.  This has the added advantage that, whenever a form is
opened in Designer and resaved, it will be in the new format. Even
without resaving, the old format will be converted on the fly for the
interim (interim == the next few release cycles)

Also, we will have to remove the current positioning logic from the UI
drivers and into an Absolute Positioning layout adapter. (err, is this an
advantage or a disadvantage?)



==============================================================================
Sample using no layout management
==============================================================================
<form>

 <!-- snip -->

 <page>
   <block>
     <label text="Hello world!"/>
     <label text="You want more text to appear?"/>
     <label text="Another comment"/>
   </block>
 </page>
</form>



==============================================================================
Sample using Absolute Positioning
==============================================================================
<form xmlns:abs="GNUe:Layout:Absolute">

 <!-- snip -->

 <page>
   <block>
     <label abs:x="1" abs:y="1" text="Hello world!"/>
     <label abs:x="1" abs:y="3" text="You want more text to appear?"/>
     <label abs:x="1" abs:y="5" text="Another comment"/>
   </block>
 </page>
</form>


==============================================================================
Sample using Box Layout
==============================================================================
<form xmlns:box="GNUe:Layout:Box">

 <!-- snip -->

 <page>
   <block>
     <box:boxLayout orientation="vertical">
       <label box:insets="0;0;0;0" box:alignX="left" text="123456"/>
       <label box:alignX="right" text="456"/>
       <label box:alignX="left" text="78901"/>
       <box:boxLayout orientation="vertical">
         <label box:alignX="center" text="nothing"/>
       </box:boxLayout>
     </box:boxLayout>
   </block>
 </page>
</form>


==============================================================================
Sample using Box Layout
==============================================================================
<form xmlns:box="GNUe:Layout:Box" xmlns:bag="GNUe:Layout:GridBag>

 <!-- snip -->

 <page>
   <block>
     <bag:gridBagLayout>
       <label text="Hello"/>
       <label text="Hello"/>
       <label text="Hello" bag:width="remainder"/>
       <label bag:anchor="northwest" bag:width="2" text="Hello here all"/>
       <box:boxLayout orientation="vertical" bag:width="remainder">
         <label box:insets="1;0;1;0" text="SuperDupa"/>
         <label box:alignX="right" text="EndeDas"/>
       </box:boxLayout>
     </bag:gridBagLayout>
   </block>
 </page>
</form>