Removed all uses of tile_special_type outside savegame handling.

See patch #4335


git-svn-id: svn://svn.gna.org/svn/freeciv/trunk@23867 a0f10bec-cc02-0410-94fc-a9cfff90b4cd
After installing a modpack, refresh "installed version" shown in Qt modpack installer.

See patch #4339


git-svn-id: svn://svn.gna.org/svn/freeciv/trunk@23868 a0f10bec-cc02-0410-94fc-a9cfff90b4cd
Generate the SDL clients' spy/diplomat action menu entries in a function in stead of repeating the code.

See patch #4338

git-svn-id: svn://svn.gna.org/svn/freeciv/trunk@23870 a0f10bec-cc02-0410-94fc-a9cfff90b4cd
Added new sourcefiles with translatable strings to POTFILES.in


git-svn-id: svn://svn.gna.org/svn/freeciv/trunk@23871 a0f10bec-cc02-0410-94fc-a9cfff90b4cd