Alien ruleset: set "Visible_Walls" effect value to 2 if city has Force Walls and player
knows Strong Force technology.

See patch #4699


git-svn-id: svn://svn.gna.org/svn/freeciv/trunk@24937 a0f10bec-cc02-0410-94fc-a9cfff90b4cd
Added functionality to rename techs to freeciv-ruledit.

See patch #4708


git-svn-id: svn://svn.gna.org/svn/freeciv/trunk@24938 a0f10bec-cc02-0410-94fc-a9cfff90b4cd
Clear server scan timer ID when scan is finished.

See bug #22066


git-svn-id: svn://svn.gna.org/svn/freeciv/trunk@24939 a0f10bec-cc02-0410-94fc-a9cfff90b4cd