stable user mode simulator

this version finally fixed a few nagging bugs i the user mode simulator that prevented the compiler from regenerating the kernel
from source. this problem is now gone, so the simulator can be used to develop micronix kernels from the last snapshot from the
dusty crannies of time.

this kernel source in src/kernel, and is placed into /usr/src/sys when generating the filesystem from the top Makefile.

the directory structure has been completely redesigned, but the README.md file is out of date.