[DGD] kotaka: Promoted bigqueue to fully featured bigdeque

[Shentino]

The supplied bigdeque struct in mudlib::~System/lib/struct and friends who
inherit them in ~/lwo and ~/obj have just gotten a makeover and now support
operations on both ends of the queue.

Now AFAIK they mimic as closely as possible the behavior of the C++ standard
versions of std::deque<T>

Just for kicks I also tried to make them robust against any clowns fiddling
with array_size in the config file and then rebooting.

Check out the latest code from the sf git repo at git://
kotaka.git.sourceforge.net/gitroot/kotaka/mudlib, subdir
mud/home/System/lib/struct/bigqueue for more information.