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 BMSbits, even for moving gribs
Support interpolation between gribs which have different resolutions
Merge branch 'master' of https://github.com/OpenCPN/OpenCPN

Conflicts:
	plugins/grib_pi/src/GribRecord.cpp
	src/chart1.cpp
rework accelerated pan logic to avoid assert and extra calculations
use xz compression for deb packages (if cpack supports it)
do not rebuild the toolbar here.  It causes the toolbar to get rebuilt too early
on some window managers and the toolbar is forever hidden and opencpn unusable,
if any plugin installs a toolbar icon. The toolbar is already rebuilt at startup
and after options so doing so here is not needed.
fix compression setup logic to avoid crash
fix bad rendering problems for opengles
update grib plugin to not use gldrawpixels.  This is faster and works on opengles
Merge branch 'master' of https://github.com/OpenCPN/OpenCPN