civ2civ3: add maglev

Patch by David Fernandez <bardo>

See patch #4966

git-svn-id: svn://svn.gna.org/svn/freeciv/trunk@25705 a0f10bec-cc02-0410-94fc-a9cfff90b4cd
civ2civ3: increased fuel of air units

Patch by David Fernandez <bardo>

See patch #4812

git-svn-id: svn://svn.gna.org/svn/freeciv/trunk@25706 a0f10bec-cc02-0410-94fc-a9cfff90b4cd