weight_bbd: handles now multiple input files
SRTShortcuts layer menu: new entry for yearly weighted file
data update
fragezeichen2org: explicitly use monthly weighted files

The former glob was matching both the existing monthly and the new
yearly files. Now it's again only the monthly files.
data update (minor)
.travis.yml: PDF::Create 1.07 and Glib 1.303 are broken

Force earlier versions. See comments in the .travis.yml for the
corresponding RT ticket numbers.
.travis.yml: allow also Perl 5.8 builds

For Perl 5.8, an older DBD::XBase will be installed.
.travis.yml: avoid test failures because of version number warnings

In Perl 5.8.9, File::Path has an underscore version number. This is
causing warnings when File::Temp is loading it, which is causing
failures in the test suite.