Added the command j6bt (and renamed popc_stack to j6stack) to make tracking kernel callstacks across interrupts easier.
GDB works far better now with QEMU's `-S` flag. No longer does it complain about changing the target from 32 to 64 bits. Get rid of the old `waiting` loop and `sleep` call in the GDB config for the kernel. Tags: debugging
See README.md for more information.