Patches for 1.4.19

Other pending patches from the ticket queue

#897

lighttpd responds 500 to ALL requests after brief period of overload (it never recovers from "cool-down" period)

#1506

added support for a wrapper directive to mod_secdownload

#1589

server.force-lowercase-filenames doesn't work inside userdir's

#1612

Directory listings should include the "type" attribute

#1627

Allow disabling bzip2 support when using rpmbuild