In building/tech/unit help, show when all players or specific nations
are granted the item at game start.

See gna patch #4908.

git-svn-id: svn://svn.gna.org/svn/freeciv/trunk@25446 a0f10bec-cc02-0410-94fc-a9cfff90b4cd
Update Palace and Courthouse help to acknowledge their interactions, and
document some missing Palace effects. Also fix some lies in the civ1
ruleset and missing effects in civ2civ3.

Courthouse/Palace interaction reported anonymously.

See gna bug #22281.

git-svn-id: svn://svn.gna.org/svn/freeciv/trunk@25447 a0f10bec-cc02-0410-94fc-a9cfff90b4cd