Changed interface of memory-syscalls and added regrem.
Fixed inconsistency of user&kernel defines.
Fixed time-reading in fs.
ext2: prevent that files are deleted while they are used.
Changed the region-API. Now we have mmap, mprotect and munmap.
They are slightly different/simpler, but work in the same
fashion. Writing changed data back is still missing, though.
Added write-back support for mmap() including a test for it.
Added a size for virtual nodes for stat().
Made the mb-mods accessible as virtual files.
Now the romdisk can use stat(), open() and mmap() to map
a mb-module instead of a specific syscall (which has been
removed now).
Set protection for TLS explicitly to RW.
Allow concurrent writing to files of different processes by def.
Prevent it when IO_EXCLUSIVE is used.
Fixed wrong size spec to itoa
VMM: Don't allow empty regions.
Fixed switch-to-vga on panic.
Removed shared-memory syscalls and replaced them with mmap.
Additionally we have shm_open and shm_unlink as library
functions to create files in /system/shm that can be
used to establish shared memory.