use xz compression to build deb package (if cpack version is enough)
fix crossings with zero-segments
Merge branch 'master' of https://github.com/OpenCPN/OpenCPN
remove declaration for removed function
fix deadlock for multiple threads testing coastline crossings
fix interpolation for gribs with negative Dj
Merge branch 'master' of https://github.com/OpenCPN/OpenCPN

Conflicts:
	include/gshhs.h
	src/gshhs.cpp
finish merge
re-enable ramonly flag so worker threads can take advantage of multi-core cpus
to build the compressed cache
because of building compressed cache at startup:
   add removed yields back they are needed for the pianowin
   don't hide toolbar, if it is hidden here, the tools are never initialized
fix interpolation for gribs with negative Dj
fix deadlock for multiple threads testing coastline crossings
Remove the debug path
fix interpolation for BMSbits, even for moving gribs
Support interpolation between gribs which have different resolutions
Improve cache rebuilt UI elements
Enable higher quality compression when building cacheable raster textures
Correct compressed texture error.
Enables extended instruction set build (/arch:SSE2) on Windows builds.
Merge branch 'master' of github.com:OpenCPN/OpenCPN into piman