Adding GeoExplorer (this was revision 35 from http://svn.opengeo.org/geoexplorer/trunk

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Adding externals.

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Just trying out the RepositoryHookSystem (see #197).

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Testing out the hook system again (closes #197).

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Stripping out plugin stuff - new interface for these.

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Align to grid again.

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Restore layer opacity and format.  Format still getting clobbered.

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Round tripping the format.

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We'll use the gxp layer source plugins instead.

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Removing duplicated code.

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Deleting what was duplicated.

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No need for this.layers.

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No need for this.map.

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Including what we need of Ext.

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And the gray images

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Update build and loaders to use local Ext.

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Create projections once.  Call queryBy function with proper scope.

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Only show rules for the current scale in the legend.  This is a workaround until http://trac.geoext.org/ticket/161 is closed (closes #170).

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Update to match index.html.

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Use the layer menu from gxp.

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