revert PR 98

This commit removes the "carryover_wml" feature which was added
just before 1.12 was branched off.

I added this feature at a time when I didn't have as good an
understanding as I do now of the networked mp code, I now believe
that it was poorly concieved and should not be implemented this
way if at all. There are better ways to achieve what was meant to
be achieved here, we are better off to remove it as it currently
exists.
Merge pull request #243 from cbeck88/remove_carryover_wml_1.12

revert PR 98: rebased, tested and now merged
clean RELEASE_NOTES file from 1.11.16

Note that some updates had already been mixed in, these were
selectively not deleted.

I left many of the known bugs in there that haven't been fixed to
my knowledge.
update changelog of release notes, about carryover WML removed
updated Czech translation
Update changelog with Micro AI changes
updated Czech translation
hopefully fixed BOM issues in Czech po files
dont delete a side from carryover if it came back to life

the previous behaviour was inconsitent, since [team]lost= wasn't read when loading a savegame. So this doesn't break previous behaviour.

This especialy fixes the scenario "Stolen Gold" from "Northern Rebirth" (http://gna.org/bugs/?22601)
allow chat_log to be opened even when not in networked games

This was requested by players, so that they can review chat logs
offline more easily.
bugfix: when toggling accelerated speed, got overlapping print msgs
update changelog
fixbug 22611: don't close the program if we can't find button image

If the main button image could not be loaded, the previous code
would throw an exception of an obscure type "error". It appears that
this was not caught anywhere except the main function in wesnoth.cpp
and so the program would close immediately.

I first tried to go into the gui initialization and construct
buttons in try catch blocks, skipping ones that have problems, but
rather than being able to proceed, this just causes a segfault
because other parts of the code assume that all buttons have been
constructed successfully. This means that not finding the image is
necessarily a fatal error.

My fix for the problem is, instead of throwing error, we throw the
more standard "game::game_error". The new behavior is, if you try
to load a theme with nonexistant images, then a black screen will
appear with a dialog

"error initializing button images! filename: buttons/dontexist.png"

The game then returns to the title screen.
update changelog
fix bug 22487: advanced preferences descriptions not showing up

For some reason, we were always using the preferences name as its
tooltip rather than the description, when displaying the advanced
preferences menu.
update changelog
read lost= from [team] when loading a savefile
fix bug 22646: tooltips broken in replay viewer

Fixes a logic error introduced in this commit:

https://github.com/wesnoth/wesnoth/commit/4e17d42679175534a0215a07cfdfad58a9fc6870#diff-89155afc5a0b890787b4bfa962f217d4R846

I'm not sure, it seems it would have most if not all tooltips
except those related to the map editor.
fix whitespace

Again from commit https://github.com/wesnoth/wesnoth/commit/4e17d42679175534a0215a07cfdfad58a9fc6870#diff-89155afc5a0b890787b4bfa962f217d4R846
update changelog