Make Barges targets more enticing (higher ESIZ)
Add icon for WM.  SDL_WM_SetIcon doesn't seem to handle transparency...

When the image has an alpha channel, it seems to just supply a black
 background, rather than alpha-blending in the window manager.  Though I
 suppose it could be Xfwm that's at fault, since I haven't tested with
 anything else.
Anyway, for now I've just not given the icon an alpha channel, so it gets
 a white fill background.
Makefiles and static libs for building static binary
Add Makefiles, ifdeffed hackery, etc. for Windows build
static: Tweak makerule so we can 'make install' a static build
Put a lower-bound on chance to sink a ship when getting a hit

Otherwise at DCLASS_ROTHER=2, Blenheims often have literally zero chance.
Explicitly store number of DClasses in savefile, for when we add more