clib2 Code

- Added an error/EOF check in the input drain loop.

- Integrated Peter Bengtsson's termios code. Thank you very much! I chose
to add it to libunix.a rather than keeping it in a separate libtermios.a
library.

- The scanf() family now supports character ranges for the %[
conversion. Note that this is a non-standard feature!

- Added more casts for the powf() function parameters.

- Made ACrypt() compile again.

- Updated the smakefile, so that it includes the new math object files.

- Replaced the (float) casts in strtof() with calls to powf().

- Ported acosh(), acoshf(), asinh(), asinhf(), lgamma(), lgammaf(),
remainder() and remainderf() for C99.

- 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.