* glib/IOChannel.cs: IOChannel wrapper implementation.
* glib/Makefile.am: build new files.
* glib/Marshaller.cs: new string array marshaling methods.
* glib/Spawn.cs: g_spawn* wrapper implementation.
* sample/SpawnTests.cs: tests for the new GLib.Process class
and a cursory exercise of IOChannel for SpawnAsyncWithPipes.
svn path=/trunk/gtk-sharp/; revision=89477