clib2 Code

- Fixed two linker errors which were caused by duplicate symbol definitions.

- Added code to the startup routine which allows you to monitor where command
was started from and which parameters it was invoked with.

- The record locking semaphore could wind up getting added to the public
list twice. Fixed.

- Changed how errors are detected, as returned by Write(), Read() and
Seek(). Seek() is particularly challenging because the value it
returns might be a valid file position and not an error.

- Replaced numeric function return codes of 0 and -1 with macros OK,
SEEK_ERROR/ERROR to clarify the respective purposes.

- Changed how ftell() and fseek() are used, double-checking the return
value and the errno code.

- Changed how error conditions raised by dos.library file I/O functions
are detected.

- Modified function return values of 0 and -1 to use macros like OK,
ERROR/SEEK_ERROR instead, to better convey what the purpose of these
values is.

- Reversed the change in rename() which enforced deletion of the target file.

- The Unix-like rename() now removes the target file even if that
file has been protected from deletion.

- Added the two release archive build scripts.

- Fixed the startup build target directory names.

- Changed how the startup code is built for the different library flavours,
and which files this involves.

- Final version bump before release.