Identify2

This adds most features of the Identify Tool plugin to the main Identify map tool

please add your comments/suggestions

a tab widget allows to see the data in one of 3 ways

Tree, as previously
Table, a table view of Vector and Raster layers (Layer, FID, Attribute, Value)
Graph which shows a plot of raster layers, very basic for now (virtually identical to the plugin) and only qwt5 for now

this replaces a previous pull request, which contains some screenshots and a short discussion with @3nids and @NathanW2

https://github.com/qgis/QGIS/pull/1293

https://cloud.githubusercontent.com/assets/1018556/2625666/16a1700e-bda4-11e3-8340-d757f37cb874.jpg
https://cloud.githubusercontent.com/assets/1018556/2625664/169fc2ae-bda4-11e3-9d79-6dc72eb37770.jpg
https://cloud.githubusercontent.com/assets/1018556/2626299/5748a202-bdc8-11e3-9867-e6aaeaac7575.jpg