Metapensiero-extjs-desktop

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* New MP.form.Panel, a customized form panel

* New CurrencyField, to edit money amounts

* Fix columns width auto-resize

* Do not use external sed to strip <debug>..</debug> section, to
help poor Window$ users

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* Use setuptools instead of distribute

* A function ``shouldBeDisabled()`` may be attached to an Action
instance, and in such a case it may override the usual
MP.action.Plugin's ``shouldDisableAction()`` function

* Install ExtJS 4.2.1

* Module.configure() now accepts a third argument, a configuration
object, which is passed to each called function and also to the
final callback

* Expose `remoteGroup` configuration option on grids

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* The old forceFit configuration on custom grids has been removed as
its goal is better fulfilled by the new ExtJS 4 flex option on the
specific columns: it caused layout problems on grids when
showing/hiding columns

* The background image of the desktop (the wallpaper) may be either
"tiled", "stretched" or "centered", controlled by the property
"wallpaperStyle" on the desktop

* Use a more generic name for the main CSS, "app.css" instead of
"modules.css" (existing apps can either rename the "modules.css" or
create a "app.css" containing ``import "modules.css";``)

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* New Pyramid scaffold to create a barebones desktop project

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* ExtJS 4.2.0 final

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* First usable version of the new packaging