put version in library so name

[kevinkreiser]

lintian warns about so name not matching version. this doesnt stop us from publishing it but it would be nice if we would do it anyway. one reason for doing this is to be more clear about what version of the library is linked by what executables. especially because we will be installing versions over top of or first purging previous versions before installing new ones it'd be good to be able to see the version number in the library itself. generally a link will be made anyway without the version in the actual so name so that the generic non version name of the so file will be there pointing to the versioned one.

here might be some info on how to do this: https://autotools.io/libtool/version.html