Changelog for QGIS 2.8.0
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* General : Bookmarks can be imported/exported

* General : Enter expressions into spin boxes

* General : Improvements to expressions

* General : Continuous testing framework and QA improvements

* User Interface : Improved/consistent projection selection

* Symbology : Raster image fill type

* Symbology : More data-defined symbology settings

* Symbology : Live heatmap renderer

* Symbology : DXF export: improve marker symbol export

* Symbology : Map rotation in canvas, improved rotation in composer

* Symbology : Multiple styles per layer

* Print Layouts : Composer GUI Improvements

* Print Layouts : Label item margins

* Print Layouts : Grid improvements

* Digitising : Advanced digitizing tools

* Digitising : Improved simplify tool

* Digitising : Snapping improvements

* Data Management : Support for creation of temporary memory layers

* Data Management : Custom prefix for joins

* Data Management : Support for calculations on selected rows

* Layer Legend : Show rule-based renderer's legend as a tree

* Analysis Tools : Measure dialog improvements

* Processing : New algorithms

* Processing : New geometric predicate parameter type

* Browser : More responsive browser

* Data Providers : Support for contextual WMS legend graphics

* QGIS Server : Server python plugins

* QGIS Server : Support for layer styles

* QGIS Server : Add DescribeLayer Method to WMS

* Plugins : Python console improvements

* Programmability : Add comment functionality to expressions

* Programmability : Bulk loading spatial index

* Programmability : Custom expression function editor

* Programmability : Run only the selected part of a SQL query

* Programmability : Qt5 support