8 v2 correct xsane et al snprintf under artistic

xsane, sane-frontends, sane-backends, and sane-backends-extras all use slightly different local snprintf s drawn from an old release of LPRng which are under the Artistic License.  The autoconf setup isn't good enough to detect and use the system snprintf.

The problem was also reported to Fedora and as per spotrh's comment in User Issue 10713 they solved the problem by refactoring the more recent and acceptably licensed snprintf.c from current LPRng. Which they have sent to Sane.  The xsane patch spotrh provided was used to reconstruct this and rather than manage four patches these four essentially identical helper commits copy this over the existing file and update debian/copyright with a shim.  The shim is kept in DATA/blah with the new file for clarity of licensing of the code.

See merge request !12

Fix leny2010/package-helpers#7 Bug 11795

Fix leny2010/package-helpers#8 Bug 11794

Fix leny2010/package-helpers#6 Bug 11793

Fix leny2010/package-helpers#7 Bug 10713

Bugfix ubuntu release upgrader

There were multiple issues:
 - Sed tries to change symbolic links not owned by the user
 - Some packages were removed. This isn't needed when using trisquel chroots, as those packages are never avaliable.
 - The package used one file from ubuntu-drivers-common related to non-free nvidia drivers, that is not needed in trisquel. The source file can be found [here](http://bazaar.launchpad.net/~ubuntu-branches/ubuntu/utopic/ubuntu-drivers-common/utopic-proposed/view/head:/share/obsolete)

See merge request !10

V2 helpers as user

See merge request !7

5 v2 crontab2english under artistic

Fix leny2010/package-helpers#5 for GNU FSDG bug report 10868

See merge request !11

As per leny2010/package-helpers#5

It wasn't a build-dep, and the only contents were packages not avaliable in trisquel.

Feature wxmaxima

Backported wxmaxima from ubuntu 14.10

Fixes #12785

See merge request !8

1 v4 allow ckermit into belenos

A rework of !3 to ensure the old commits are dropped.  That was simply me starting the weekend without either getting an update from @aklis or doing a long paperchase through the repos.

As per !3 i.e.

As per leny2010/package-helpers#1 ckermit has been free for some time. It has now percolated down to Multiverse in Trusty. Here is the package helper to bring it in.

I suggest you close !3 rejected

See merge request !4

Fixes #12785

Fix helper for firefox 34

See merge request !2