This one contains these changes from main c55:
* Adds a function to check if there is room for a specific item
* Using that, you can now pick up rats if you have a full inventory and a not full rat stack
* Furnace would cook only 1 item if that item used the last available result slot, now it will continue
* Furnace will say it's overloaded
* Furnace won't wait until the next step to start on the next item
 - This caused small fuels to cook slower than meant to
 - Also caused furnaces to say they were out of fuel after finishing the last fuel item

Also contains some commented-out code for testing out different looks
in the future.

Some access violations and segfaults and strange behaviour might have
been caused by this.

-- TOCLIENT_OBJECTDATA: peer ID field is missing
-- TOCLIENT_ACTIVE_OBJECT_REMOVE_ADD: added: init length should be u32, not u16

If a block has (at least visible) liquids, the block below should also
be flowed in.

See explanation in http://2pktfkt.de/irc/minetest-delta/2011-08-22.html

This is just a chat window with the / text pre-loaded.

This ensures that on creation and when resizing the cursor is at the end
of the text rather than at the beginnig.

No need to make the server command syntax more complicated than
necessary. If the need ever arise, we'll find some other way to
distinguish the client commands. Also, the /# syntax is deprecated and
will be made obsolete in time.

This allows us to map the keys which are not considered in
irrlicht's EKEY_CODE system, such as \, [, /, ] etc.

This should fix the remaining cases of fluid not advancing or not
retreating.

No need to curb their spread artificially.