Show altitude even when not in rotating frame.
Show vertical speed together with altitude.
Use parent frame for starports and only calculate altitude if close enough.
fix detection/fallback for multisampling, etc, during GL context creation
extract method CreateWindowAndContext in WindowSDL to simplify setup
Update Spanish.txt
allow pickling Lua strings that contain zero bytes (ie, arbitrary blobs)
Merge remote-tracking branch 'johnbartholomew/fix-pickle-blobs'
Merge remote-tracking branch 'johnbartholomew/sdl2-fixes'
Merge remote-tracking branch 'gudadantza/patch-39'
something about line endings, I don't quite understand what's happening
Fix frame confusion and some minor issues in altitude/vspeed calculations.
Fix segfault during exit.

The job runners are threads that use the job queue, but when the job queue is
destroyed at program exit, the job runners continue to run. On some occasions
they were attempting to run job queue functions after the queue was destroyed,
causing the segfault. This patch addresses that by adding a mutex and a flag
that belong to the job runners, telling them that the queue is destroyed so
they avoid accessing job queue functions.

Most of the credit belongs to Robert Norris who helped with diagnosis, code
structure explanations and hints.
use static_cast when casting between void* and a specific pointer type

See this StackOverflow question:

http://stackoverflow.com/questions/310451/should-i-use-static-cast-or-reinterpret-cast-when-casting-a-void-to-whatever

But note that reinterpret_cast for this does work fine in practice, and is
defined to work fine in C++11 (assuming that change got through committee).

My reason for preferring static_cast is really that static_cast works,
so taking reinterpret_cast out of the big scary toolbox of C++ features
marked "use-at-your-own-risk", "here-be-dragons", is not necessary and
should therefore be avoided.
use static_cast when downcasting from Body* to a derived class

reinterpret_cast is incorrect for this purpose, and could result in
serious bugs.
Merge remote-tracking branch 'johnbartholomew/cleanup-reinterpret-cast'
Merge remote-tracking branch 'lwho/altitude_view'

Conflicts:
	src/WorldView.cpp
data/lang/Polski.txt
N_WHATEVER_RADII
ALT_IN_METRES
ALT_IN_KM
Removed the miniz project and references to miniz.lib
Updated the various vs2012 and vs2013 projects for SDL2 changes.
Merge remote-tracking branch 'fluffy/UpdateVS2013ExpForSDL2'