Kernel support for Z180 CPUs
cpm-loader: Tools to make a CP/M application which boots the Fuzix kernel
cpm-loader: Fix minor typo in comment
Kernel: Improve simple timer code. Remove timer.h include where it is not required.
Kernel: Allow boot device number to be greater than 9
Kernel: lowlevel-z80: Remove unused map_process symbol
Kernel: Whitespace fix for start.c
Kernel: Increment both 16-bit and 32-bit tick counters on every timer interrupt
Kernel: Add N8VEM Mark 4 and DX-Designs P112 platforms
Kernel: Tidy up p112 and n8vem-mark4 targets, remove redundant code and merge memory mapping functions into common Z180 code.
Kernel: Bug fix -- on system call, touch kernel_flag only after switching to the kernel memory bank
Kernel: Remove obsolete lines from kernel.def on p112 and n8vem-mark4 platforms
Merge remote-tracking branch 'alan/master' into toupstream
Kernel: Useful debug routines for Z180 (commented out)
Kernel: Bug fix -- bankfixed pagemap_realloc() check was too strict
init: remove use of the malloc package

We can sbrk up our own environment strings and that cuts init down to about
9K. Way more than it should be, but most of what it drags in now needs
fixing in the libraries instead.
Merge pull request #30 from willsowerbutts/toupstream

Fuzix kernel Z180 support, p112 and n8vem-mark4 platforms, other minor fixes
README.md: new ports from Will
timer: remove dead timer reference from other ports
timer: remove more dead references