Made alien ruleset empire size penalties less severe
- Base Empire_Size_Base and Empire_Size_Step increased to 15
- Knowledge of "Communication" further increase them to 20

See patch #4946


git-svn-id: svn://svn.gna.org/svn/freeciv/trunk@25658 a0f10bec-cc02-0410-94fc-a9cfff90b4cd
Fix sdl/2 client graphics.c clang alignment warnings

See patch #4957


git-svn-id: svn://svn.gna.org/svn/freeciv/trunk@25660 a0f10bec-cc02-0410-94fc-a9cfff90b4cd
Replaced direct 'sed' with '$SED' in configure in easy cases.

See patch #4958


git-svn-id: svn://svn.gna.org/svn/freeciv/trunk@25662 a0f10bec-cc02-0410-94fc-a9cfff90b4cd
Added new sourcefiles with translatable strings to POTFILES.ins


git-svn-id: svn://svn.gna.org/svn/freeciv/trunk@25663 a0f10bec-cc02-0410-94fc-a9cfff90b4cd
Added achievement type "Metropolis"

See patch #4948


git-svn-id: svn://svn.gna.org/svn/freeciv/trunk@25664 a0f10bec-cc02-0410-94fc-a9cfff90b4cd