clib2 Code

- Moved the common DateStamp to time_t conversion code into a shared
function.

- The fall-back function for converting time into a string in strftime()
now calls itself for the "%x" and "%X" format specifiers.

- Added instructions for switching over an existing Amiga 68k GCC installation
to use "clib2".

- Added a check against DBL_EPSILON in log() and log10() in place of the
check against 0 that used to be in there.

- The default console output window opened when a program is launched
from Workbench would open and stay open. This was not intended to
happen and is a side-effect of the new stdio initialization code which
checks if the stdio streams are in non-blocking mode. Fixed.

This commit was manufactured by cvs2svn to create tag 'V1_186'.

- Added a missing definition to stdio_init_exit.c which is part of
the OS4 header files, but not of the older header file distributions.

- close() did not reset the non-blocking file property, as it should
have. This only worked for files which were closed anyway, but not
for the stdio streams. Fixed.

- Lost some more code that is not required for AmigaOS 4.x and can be
handled conveniently through conditional compilation.

- Whether or not stdio console streams are blocking or non-blocking
is now determined at initialization time. The I/O mode is restored before
the program exits. Previously, any changes to the I/O mode would persist.

Added -a switch to cp so that it behaves like Copy CLONE.