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
Merge pull request #30 from willsowerbutts/toupstream

Fuzix kernel Z180 support, p112 and n8vem-mark4 platforms, other minor fixes