Metapensiero-extjs-desktop

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* Minification script overhaul, now able to automatically determine
the list of needed scripts given just the application's modules

* Eliminated MP.grid.column.CheckColumn, since it's been integrated
into ExtJS 4

* Load a custom ext.js, workaround to br0ken ExtJS 4.2.1 bootstrap

* Updated Pyramid scaffold project

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* Fix the batching of lookup combos, properly setting the pageSize of
the store and of the widget itself

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* Minor tweaks to the desktop CSS

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* UK english translation catalog: thanks to Elisa to enlightening me
about the fact that the "m/d/Y" date format is a US-only
idiosyncrasy!

* Stabilized translatable messages extraction

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* Fix ExtJS 4.2.1 ColumnManager

* Handle readonly state corner case

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* Fix several (mostly minor) i18n issues

* Added an explicit English translation catalog