[-bug] Sympa::Spool::Incoming might skip messages with low priority. Thus, upgrade_send_spool.pl could leave some messages not upgraded.
Fixed by making spool class not to skip messages: Instead, Sympa::Spindle::ProcessIncoming will omit messages unnecessary.
Also, made some cleanups on related classes.

FCGI scripts will not always restart when they are updated by ikedas

- exit(0) was caused only when script file is updated: On binary distributions this assumption is not true. If would be caused anytime when timestamp is simply changed.
- The time of startup was used for origin of change. Timestamp of script would be used instead.
- Non-standard `SCRIPT_FILENAME` environment variable was referred. Instead use `$PROGRAM_NAMe` (`$0`).

Updating translation catalogs.

Additional bug fixes and enhancements for PR #45

Activating options in XSS Parser

[feature] New robot parameter "allowed_external_origin" to defined external links allowed to be included in sanitized HTML.

Links to images (src attributes) were limited to be under wwsympa_url;
links to other pages (href attributes) were simply inhibited.

Fixed by defusing restrictions so that links with the same origin
(roughly, host part) as wwsympa_url will be allowed.

It makes sense to use the same options as previous versions. Specially AllowHref to don't strip hrefs of links