Release 3.1.1

This is a production release that adds two Spanish locales. Users do NOT need to upgrade, unless they want those locales.

$ sha512sum bc-3.1.1.tar.xz
1f770edf619ade8780d0a494934071bfa82d1298043459cab6e3db6a5617e6aad0d7193635c868ef0d0312b808027ad3734cb92b0c8eff826cd5a860eb3fe6d2  bc-3.1.1.tar.xz

$ sha256sum bc-3.1.1.tar.xz
7401c68baef31622251eac47cabe0e35c973baec6b938b20741f777cf58d2dce  bc-3.1.1.tar.xz

$ stat -c '%s  %n'
209328  bc-3.1.1.tar.xz

$ sha512sum bc-3.1.1.tar.xz.sig
ee6f0d7e3b2120b59373b2d35316da43350c397e7005efa90da181805307d475057ea846f76a2751e57803918381dee08e5e3e1c12df66daedc83ba72b90bcf5  bc-3.1.1.tar.xz.sig

$ sha256sum bc-3.1.1.tar.xz.sig
0067d965d94ff87f8f9cbf8a95ae76f72b72f60607231b4437313e4ae435d13a  bc-3.1.1.tar.xz.sig

$ stat -c '%s  %n'
662  bc-3.1.1.tar.xz.sig