Changelog for QGIS 2.4.0
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* General : Generate band name with NetCDF EXTRA_DIM

* General : Applying scale and offset to raster data

* General : Quick field field calc bar in attribute table

* General : Colour preview modes in composer and map canvas

* General : QLR QGIS Layer files

* General : New expression functions

* General : Copy, paste and drag and drop colours

* General : Multi-threaded rendering

* Symbology : Shapeburst fill style

* Symbology : Option to shift marker line placement

* Symbology : New Inverted Polygon renderer

* Symbology : Saving and recovering styles with Spatialite layers 

* Labelling : Label features multiple times

* Print Layouts : Improvements to HTML frames

* Print Layouts : Improvements to composer picture items

* Print Layouts : Predefined scales mode for atlas maps

* Print Layouts : Improved attribute tables in composer

* Print Layouts : General composer improvements

* Analysis Tools : Identify tool improvements

* Plugins : MetaSearch Catalogue Client Plugin