Use Memory Mapping functions in ShenTSP. Build TSP Header offset into the voxel data array pointer instead of adding it; also prevents problems if Header size changes.

Slightly speedup application close

Reactivate TransferFunction::update. TransferFunctionHandler in Volume module will eventually replace this.

* Version of touch interface for user study that has disabled panning and limited zoom to prevent zooming through the planet surface

* Update starlabels.data file

* Enable minimum picking distance in NDC

* Fix stack corruption bug in TouchMarker

* Version of touch interface for user study that has disabled panning and limited zoom to prevent zooming through the planet surface

* Fix stack corruption bug in TouchMarker

* Add time limit to levmarq solver

* Add debug properties to touch GUI with a compile time flag

* Guard against accessing outside bounds

* Added exponential zoom for faster zoom with increased distance from focus node

* Refined the exponential zoom for better behavior on the touch table

* Added properties for disabling panning and node boundary sphere multiplier for zoom

* Added more debug logging and stopped using camera focusNode (looks deprecated) for distance calculation

* Found error in the deceleration algorithm

* Default-disable debug logging, exponential zoom coeff change and additional debug log statement

Modified SGCT configuration commands to allow aspect ratio tracked keyword in openspace config file (#560)

Web GUI from Klas Eskilson (three new modules: webgui, webbrowser and cefwebgui)
Parallel connection refactorization
Wormhole server added to the main repository
Transfer function editor work from Cristoffer Särevall
Update ghoul