Add a gnupg keyring for release tag signature verification

Add a gnupg keyring containing just the public part of the keypair used
to sign release tags.

Also change the githelper script to use the keyring in the git repo
instead of the one in the caller's home directory.

Signed-off-by: Sebastian Kuzminsky <seb@highlab.com>
Merge remote-tracking branch 'origin/2.6' into 2.7
new release key for 2.7 and later

This commit removes the public key named "LinuxCNC 2.6 Release Manager"
and adds a new public key named just "LinuxCNC Release Manager".
I'll use the new key to sign future releases in 2.7 and later.

The new key has the email address <emc-developers@lists.sourceforge.net>,
instead of <seb@highlab.com>.

Signed-off-by: Sebastian Kuzminsky <seb@highlab.com>
LinuxCNC 2.7.0~pre2

Signed-off-by: Sebastian Kuzminsky <seb@highlab.com>
hm2 test: plenty of room in dmesg for debug messages now

Hardy's RTAI kernel had a severely limited dmesg buffer, but that's
behind us now.

Signed-off-by: Sebastian Kuzminsky <seb@highlab.com>
hm2 test: don't violate strict aliasing rules

Signed-off-by: Sebastian Kuzminsky <seb@highlab.com>
build-depend on inkscape

We use dblatex in our docs build system, and it uses inkscape to convert
svg images to pdf for inclusion in the pdf docs.

Unfortunately the version of dblatex in Debian Wheezy (and probably other
distros) is missing the dependency on inkscape, so our pbuilder builds
of the pdf docs fail.  The resulting pdf documents are made with a text
string with the name of the svg file, instead of the image contents of
the svg file.

I opened Debian Bug #766945 to track this:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=766945

This commit adds to linuxcnc an explicit build-dependency on inkscape,
even though we dont "manually" use it during the build.  This explicit
build-dependency should be removed when we can expect a correct version
of dblatex.

Signed-off-by: Sebastian Kuzminsky <seb@highlab.com>
Merge remote-tracking branch 'origin/2.7'

Conflicts:
	VERSION
	debian/changelog
LinuxCNC 2.8.0~pre1 pre-release

Signed-off-by: Sebastian Kuzminsky <seb@highlab.com>