postgresql_8.4_extradoc: Don't archive XSLT HTML build

The output directory in 8.4 is different, so this would be more
difficult.
Add log rotation to *_world jobs
Raise memory for FOP slightly

It appears to work slightly better that way.
Add .dir-locals.el

It contains Emacs settings for editing XML files so that newlines are
not added automatically.  This matches the XML files that Jenkins
generates.