Very rough start of vcpu implementation. Gets to the point where it dies because of missing modules/disks to boot from.
Implemented OP_GET_MODULE.

With this we can actually execute some code now. We miss timer event handling, so we don't get very far, though. We die with SIGALRM.
Do not use signals for timeout delivery, use a thread instead.
Do not use -lrt twice. CheckLib already appends to correct linkflags.
Build instructions.inc on demand.
Shut up compiler warning.
Implemented CLFLUSH (I hope.) Fixes #4.
Implemented cmpxchg8b with lots of help from Bernhard. Fixes #5.
Updated .gitignore to include instructions.inc.