clib2 Code

- Corrected the thread-safe clearerr() macro.

- Fixed math_headers.h so that fabsf.c compiles correctly with SAS/C.

- Added "fstat_stdout_test".

- Small fixes to the scanf() family.

- Hid two more program files.

- Added test cases for C99 format conversions.

- For the printf() "%a" conversion the exponent now comes out as a binary
number rather than a decimal one. Now how odd is that?

- strtod() and strtof() now support "inf"/"infinity"/"nan"/"nan(..)" and
hexadecimal floating point numbers, for C99.

- Added the fpclassify(), isfinite(), isnormal() and signbit() macros for C99.

- Reimplemented isnan() and isinf() as macros for C99. The corresponding
functions will be dropped from the library. Note that the isinf() macro
does not return -1, 0 or 1 like the old function did, but only 0 or 1
depending upon whether the parameter represents +/- infinity or not.

- Added fabsf() for C99.

- Added HUGE_VALF to <math.h>.

- The printf() family now supports the %hh, %j, %t and %z modifiers and the
%a/%A conversions for C99. The %j is treated like %ll, %t and %z are treated
like %l.

- Plugged in the proper ISO 8601 week number calculation function.

- strftime() now ignores the E and O modifiers.