Just as what used to happen with 'db_recover', a lot of users are now
running the wrong version of 'db_archive'. So we're wrapping this BDB
function in svnadmin, so it will always Just Work (correct library
version, no need to remember -a or -h flags.)
IMO, 'svnadmin archive' and 'svnadmin recover' are the only two
BDB maintenance commands that svn admins really need to know, and
hopefully svnadmin has made them easier to use.
* libsvn_fs/fs.c, svn_fs.h (svn_fs_berkeley_archive): new wrapper
around the bdb ENV->archive() function.
* svnadmin/main.c (svn_opt_subcommand_t, cmd_table): add 'archive' subcommand.
(subcommand_archive): new function.
* project_faq.html: mention 'svnadmin archive' in FAQ.
* book/ch05.xml (Berkeley DB Utilities): show example of 'svnadmin archive'.
* book/ch08.xml (svnadmin): document new subcommand.
