Log Message:
3.16.4 (2017/01/04)

    Command line tools:
	Add offscreen Qt plugin to allow running QCAD command line tools in Linux \ 
server environments
    Bug fixes:
	FS#1525 - Block attributes: escaped unicode sequences in files not converted on \ 
loading

3.16.3 (2016/12/28)

    File > Bitmap Export...:
	Add options for color, anti-aliasing, margin to compensate for lineweight
    Edit > Convert Unit:
	Converts the unit of a drawing
    Part Library Browser:
	Add gear generator item (default > Mechanics > Gears > InvoluteSpur)
    QCAD Professional:
	Draw > Hatch > Hatch from Segments:
	    Use selection color to highlight selected boundary
	Save active layer in file, restore on load
    Bug fixes:
	FS#1517 - Modify > Break out Segment: fails with closed polyline
	FS#1519 - Ruler precision always zero
	FS#1520 - Modify > Rotate: rotating splines changes start/end tangents
	FS#1521 - Modify > Offset: fails in certain cases with short arcs
	FS#1523 - Draw > Hatch > Hatch from Segments: fails for circle in circle
	FS#1524 - Command line: cannot enter @ sign in command line on German keyboard

3.16.2 (2016/12/20)

    Bug fixes:
	FS#1514 - Block attributes: association with block reference lost on copy / paste

3.16.1 (2016/12/16)

    Improved precision of arc rendering for screen-based linetypes
    Bug fixes:
	FS#1513 - Layer > Create Layer from Selection: Layer created, selection unchanged