[sane-devel] Fix PPA build

[James Duvall]

Rolf,
Thanks for getting your ppa back up and running.  However, I am not able to install the libsane package using apt, even when I try to force the version.  I believe that your new version numbering with ~ is causing the problem.

ver=1.0.26~ppa20170508-yakkety0; sudo apt-get install libsane=$ver libsane-common=$ver sane-utils=$ver
Apt complains that 

The following packages have unmet dependencies:
 libsane : Breaks: libsane-common (< 1.0.26)
           Breaks: libsane-common:i386 (< 1.0.26)
E: Unable to correct problems, you have held broken packages.

I think the issue is that version 1.0.26~ppa20170508-yakkety0 compares less than 1.0.26 due to special rules for handling ~ in version numbers.  The following shows this:
dpkg --compare-versions 1.0.26~ppa20170508-yakkety0 lt 1.0.26 && echo true
true
I created a local repository and re-packaged as version 1.0.26+ppa20170508-yakkety0 and was able to install with no problems, so maybe change the ~ for + or some other separator?  I am not experienced with debian package management, so please disregard if I am missing something.
James
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