server now sends snapshots and client uses their input
fixed printf-family errors with int64 on i386
fixed time_t and my::time::time_t mixup on i386
typo: & instead of &&
added command line world and server selection

the client can be called with -f and a file name, like "-f region" for
default.  also it can be called with -a for server selection, like "-a
localhost" for default.
region folder is now created automatically

For this purpose boost_filesystem was added as a dependency
added support for multitile textures
fixed multi-tile textures rendered incorrectly in hud
added low resolution multi-tile rock texture
Merge branch 'msvc'