GSim 0.19.0 released

GSim 0.19.0 released.

New features:

* Echo-antiecho processing (experimental support)

* Coloured contours for 2D contour plots can be toggled by 'C' key.

* A 'legend' with contours numerical values can be displayed for 2D plots

* Y-axis label can be drawn on the left or on the right of the axis

* Improvements in the reading routine for CASTEP-generated .magres files

* The axis for FID display got new units: "points"

* Based on new Qt 4.6.1. Windows version is compiled with gcc-4.4.0

* Various bug fixes and improvements