added party full notification sound
changed notification sound to "turn bell" which is better
added game_config::sounds::party_full_sound, defaults to turn bell
and switched multiplayer_connect.cpp to use this sound
changed debugging output message
changed the logic for the bell:
connect engine must report no sides are available and game can start.
New lua metatable "wesnoth.mp_settings".
Follows pattern of previous lua hooks in src/scripting/lua.cpp.

I would like to be able to access all the fields that occur in
"multiplayer" tag in save game files.

Referring to gamestatus.cpp line 1208, which is what writes
the game state to a config for output, I check if

(game_state.classification().campaign_type=="multiplayer" ),

and if so I ask the mp_settings object for fields.

Referring to line 195 of mp_game_settings.cpp, I use the same names
as appear in save files for the lua hooks.

I don't currently handle vector objects like "active_mods".
enable wesnoth.mp_settings.active_mods and side_users
(using string join functions as to_config() does)
make campaign_type visible from wesnoth.game_config
fix int mp_countdown -> bool, oops
delete explicit attribute references, write a cfg instead
remove now unnecesary include
moved mp_settings to be a (conditional) child of game_config,
using return_cfgref_attrib fcn.
works fine in testing, using path wesnoth.game_config.mp_settings
Fix a copy-paste error

Found by coverity
Simplified concentration code
Fix a copy-paste error

Found by coverity
Factor out two nearly-identical format_time_summary functions
Remove an unused assignment

Found by coverity
Merge branch 'master' of github.com:wesnoth/wesnoth-old
Fixed MP Create screen for low res.
scons: Handle missing environment variables properly when forwarding.
Rename 'rail' color_range to 'rails'

Fixes the following errors appearing every time rail terrain does
in-game:

  20131210 00:19:44 error display: caught config::error while processing color-range RC: Invalid color range: rails
  20131210 00:19:44 error display: bailing out from RC
Made use of the time of day schedule macros.
Grouped the soundtrack into two albums, both around one hour in length.

This commit only changes the ogg vorbis meta tags of the files.
Draw the minimap villages at the same size as the terrain tiles.