clib2 Code

- Moved the thread-safe library documentation.

- The malloc() in libunix.a now allocates four bytes of memory instead
of just one for a request to allocate 0 bytes.

- Corrected the section numbering.

- Fixed the remaining HTML errors.

- Changed the assertion message text shown in the requester window.

- The standard malloc() now sets errno to EINVAL for zero length
allocations.

- Updated the general documentation and started to document the implementation-specific
behaviour of the library functions.

- In libunix.a malloc(), calloc() and realloc() no longer treat a
request to allocate 0 bytes as an error, returning NULL. They all
return a 1 byte memory chunk initialized to 0 instead.

- Replaced the sqrt() call.

- Added <fenv.h> for C99, and the (yet unimplemented) functions
feclearexcept(), fegetenv(), fegetexceptflag(), fegetround(),
feholdexcept(), feraiseexcept(), fesetenv(), fesetexceptflag(),
fetestexcept(), fetestround() and feupdateenv().

- Replaced the old pow() implementation. However, powf() may need to
be changed to set a domain error.

- Added more boundary checks to the FD_#?() macros which now also catch
the case of negative socket IDs.

This commit was manufactured by cvs2svn to create tag 'V1_197'.