Reworked gfx tags for roads.
- Supplied rulesets use prefix "road." for road gfx tags
- Hardcoded prefix "r." is removed from tilespec.c for those sprites for which it existed
- Old "r.c_%s_%s" and "r.d_%s_%s" formats have been rearranged to "%s_c_%s" and "%s_d_%s"
  respectively so that the ruleset tag is always in the beginning of the tileset tag 

See patch #4468


git-svn-id: svn://svn.gna.org/svn/freeciv/trunk@24432 a0f10bec-cc02-0410-94fc-a9cfff90b4cd
Reset curl handle between uses.

See patch #4469


git-svn-id: svn://svn.gna.org/svn/freeciv/trunk@24434 a0f10bec-cc02-0410-94fc-a9cfff90b4cd
Initialize variable 'redraw' to value false in a couple of functions where
its value might get checked without explicit assignment.

See bug #21612


git-svn-id: svn://svn.gna.org/svn/freeciv/trunk@24437 a0f10bec-cc02-0410-94fc-a9cfff90b4cd
Added configure option --without-freeciv-manual to disable building of freeciv-manual.

See patch #4481


git-svn-id: svn://svn.gna.org/svn/freeciv/trunk@24439 a0f10bec-cc02-0410-94fc-a9cfff90b4cd
Made dai_plr_data_get() to identify itself correctly in log message.

See patch #4483


git-svn-id: svn://svn.gna.org/svn/freeciv/trunk@24441 a0f10bec-cc02-0410-94fc-a9cfff90b4cd
Fixed detection of error in alt specialist icon loading.

See bug #21602


git-svn-id: svn://svn.gna.org/svn/freeciv/trunk@24444 a0f10bec-cc02-0410-94fc-a9cfff90b4cd