Finish the ncpcall.asm/ncpcall.h to ncp.asm/ncp.h rename.
Update the Open Watcom build, object names, include directives, header guard,
README references and file-level dependency comments to use the shorter ncp
naming. The split remains the same: ncp.asm/ncp.h provide the low-level INT 21h
and Client32 requester entry points, ncpcall.c contains requester transport
helpers, and ncpapi.c contains the ncpXX_YY_* protocol API wrappers.
No behavior change.
Split the Open Watcom assembly glue into separate IPX and NCP requester
modules.
Keep the IPX socket and far-memory helper entry points in ipx.asm and move the
INT 21h Net_Call plus Client32 requester entry points into ncpcall.asm. Split
the former kern.h declarations accordingly into ipx.h and ncpcall.h, and update
net.h and the Open Watcom build to use the new headers and object files.
This matches the current source layout where ncpcall.c owns the low-level NCP
transport helpers and ncpapi.c owns the ncpXX_YY_* protocol API wrappers.
No behavior change.
Add GPL-2-or-later license headers to the DOS utility source files and
document the purpose and local dependencies of each C, header and assembler
file.
Preserve the original Martin Stover copyright attribution for the historic
MARS-NWE utility sources, including files that did not previously carry an
explicit header but are part of the original tool set. Add Mario Fetka as the
2026 copyright holder for the current maintenance work, and use Mario-only
headers for files without original Martin Stover ownership.
Also add a root-level COPYING file containing the GPL-2 license text.
