catalog.xml: Compatibility with 1.79.1 or earlier The docbook-xsl project changed the canonical URI since 1.79.2. Besides changes made in debian/*.xmlcatalogs files, this patch completes the support of the old URI so that existing software does not break with changed registered URI.
source files not setting a date/pubdate as quick solution to #681116 to get a consistent manpage output in multiarch enabled packages independent from the build-time.
Ideally we should be using SOURCE_DATE_EPOCH instead of dropping date/pubdate at all and this should be fixed in future releases.
use EXSLT "replace" function when available A recursive implementation of string.subst is problematic, long strings with many matches will cause stack overflows.
