Cycles: show remaining render time in render info text

It's a simple estimate, not very precise but that isn't really possible always.
For progressive render it will become more accurate the longer you render.

Reviewed By: brecht

Differential Revision: http://developer.blender.org/D67
Cycles: network render code updated for latest changes and improved

This actually works somewhat now, although viewport rendering is broken and any
kind of network error or connection failure will kill Blender.

* Experimental WITH_CYCLES_NETWORK cmake option
* Networked Device is shown as an option next to CPU and GPU Compute
* Various updates to work with the latest Cycles code
* Locks and thread safety for RPC calls and tiles
* Refactored pointer mapping code
* Fix error in CPU brand string retrieval code

This includes work by Doug Gale, Martijn Berger and Brecht Van Lommel.

Reviewers: brecht

Differential Revision: http://developer.blender.org/D36
Particles: change material picking from index number in UI to menu with materials.

Also fix material slot index not being properly initialized to 1, this got clamped
from zero only on drawing the UI.

Reviewed By: brecht

Differential Revision: http://developer.blender.org/D55
OSX/scons: forgot Intel CC ( ‘icc’ ) in detection
Todo: perhaps unify this for all OS, but keep in mind:
Apple compiler versions may have other capabilities
than std gcc, llvm, clang ( other versioning also )