Added override to the list of data subdirectories.

See bug #22169


git-svn-id: svn://svn.gna.org/svn/freeciv/trunk@25117 a0f10bec-cc02-0410-94fc-a9cfff90b4cd
Implemented gtk3-client version of overriding theme background color with
unknown-tile color for map and overview canvases.

See patch #4786


git-svn-id: svn://svn.gna.org/svn/freeciv/trunk@25118 a0f10bec-cc02-0410-94fc-a9cfff90b4cd
Fixed translation statistics script in case translation has zero strings in some
category translated/fuzzy/untranslated.

See bug #22166


git-svn-id: svn://svn.gna.org/svn/freeciv/trunk@25121 a0f10bec-cc02-0410-94fc-a9cfff90b4cd
Fixed easily fixable alignment warnings from clang from sdl-clients

See patch #4785


git-svn-id: svn://svn.gna.org/svn/freeciv/trunk@25123 a0f10bec-cc02-0410-94fc-a9cfff90b4cd
Removed all obsolete gui-beos stuff from configure

See patch #4791


git-svn-id: svn://svn.gna.org/svn/freeciv/trunk@25126 a0f10bec-cc02-0410-94fc-a9cfff90b4cd