Create cache listing extra types that can act as refuel point for the unit class
at the ruleset loading time. Iterate over that list only when checking if tile
has refuel base for the unit.

See patch #4563


git-svn-id: svn://svn.gna.org/svn/freeciv/trunk@24677 a0f10bec-cc02-0410-94fc-a9cfff90b4cd
Changed effect "name" to "type" in effects in multiplayer ai_effects.ruleset.

See patch #4601


git-svn-id: svn://svn.gna.org/svn/freeciv/trunk@24679 a0f10bec-cc02-0410-94fc-a9cfff90b4cd
Bumped audio capstrings to indicate that the formats have changed since 2.5.

See patch #4600


git-svn-id: svn://svn.gna.org/svn/freeciv/trunk@24681 a0f10bec-cc02-0410-94fc-a9cfff90b4cd
Updated md5.c to match upstream revision 1.13.

See patch #4505


git-svn-id: svn://svn.gna.org/svn/freeciv/trunk@24682 a0f10bec-cc02-0410-94fc-a9cfff90b4cd