Manages memory automatically.

The implicit cast operator can be very dangerous.

Must return -1 on error, not 0.  0 is root.

Make sure glibc gives us all features.

Users now have to call Close() explicitly.  This simplifies using the
class, as most users have automatic socket management already, and
Steal() had to be used often.

No GLib memory allocation.

First check if an IPv6 socket can be created.

Regression from previous commit.  D'oh!

Use a std::list which can be appended at the end.

Prepare to migrate away from GLib.  Currently, we're still using GLib
as a backend.

Reduces header dependencies.

Replaces GLib's GError.

Fixes assertion failure.

Eliminate the C wrappers.

Use WinSock errors on Windows.

GLib 2.16 was released more than 4 years ago.  Let's remove some cruft
from the glib_compat.h header, and avoid new cruft to it.