clib2 Code

- Ported cosf(), coshf(), sinf(), sinhf(), tanf(), tanhf()
and hypotf() for C99.

- Implemented fmin()/fminf(), fmax()/fmaxf(), fdim()/fdimf() for C99.

- Ported acosf(), asinf(), atan2f(), atanf(), ceilf(), expf(), floorf(),
fmodf(), frexpf(), ldexpf(), log10f(), logbf(), logf(), modff(), powf(), sqrtf(),
scalbn() and scalbnf() for C99.

- Ported cbrt(), cbrtf(), erf(), erff(), erfc(), erfcf(), expm1(),
expm1f(), ilogb(), ilogbf(), log1p() and log1pf() for C99.

- Implemented fmin()/fminf(), fmax()/fmaxf(), fdim()/fdimf() (C99).

- Added skeleton code for acosf(), acosh(), acoshf(), asinf(), asinh(),
asinhf(), atan2f(), atanf(), atanh(), atanhf(), cbrt(), cbrtf(),
ceilf(), cosf(), coshf(), erf(), erfc(), erfcf(), erff(),
exp2(), exp2f(), expf(), expm1(), expm1f(), fdim(), fdimf(),
floorf(), fma(), fmaf(), fmax(), fmaxf(), fmin(), fminf(),
fmodf(), frexpf(), hypotf(), ilogb(), ilogbf(), ldexpf(), lgamma(),
lgammaf(), log10f(), log1p(), log1pf(), log2(), log2f(), logbf(),
logf(), lrint(), lrintf(), lround(), lroundf(), modff(), nearbyint(),
nearbyintf(), powf(), remainder(), remainderf(), remquo(), remquof(), round(),
roundf(), scalbn(), scalbnf(), sinf(), sinhf(), sqrtf(), tanf(),
tanhf(), tgamma(), tgammaf(), trunc() and truncf(), to be filled in
later...

- Added a TODO-list which at this time only covers the missing floating
point arithmetic functions.

- Added NAN, INFINITY, FLT_EVAL_METHOD, float_t and double_t to
<math.h>.

- Modified the locale-aware isalnum(), isalpha(), iscntrl(),
isdigit(), isgraph(), islower(), isprint(), ispunct(), isspace(),
isupper(), isxdigit(), tolower() and toupper() functions
to clamp the input parameter to the "unsigned char" range before
it is submitted to the respective locale.library function. This
should be in sync with what the specs demand, which state that
if the input parameter is neither EOF nor in the range of an
"unsigned char" variable, then the results are undefined.

- ungetc() now returns the input character, clamped to an unsigned
char value, upon success. Previously, if the input parameter was
negative and not EOF, the result was identical to the input, which
could have had negative side-effects.

- Added a couple of (float) casts.

- Fixed isblank() to compile properly.

- The record locking code in fcntl() is no longer part of the
regular libc.a, but only of libunix.a.

- Changed the definition of the D_S() macro to cast the pointer
address to an unsigned 32 bit integer.

- For %C strtime() should return the century number, not the
year number mod 100.