2002-07-07  Jukka Pekka  <jiivonen@hutcs.cs.hut.fi>

	* functions.c, gsl-complex.c: Implemented the following fns:
	  IMARCSIN(), IMARCCOS(), IMARCTAN(), IMARCSEC(), IMARCCSC(),
	  IMARCCOT(), IMSINH(), IMCOSH(), IMTANH(), IMSECH(), IMCSCH(),
	  IMCOTH(), IMARCSINH(), IMARCCOSH(), IMARCTANH(), IMARCSECH(),
	  IMARCCSCH(), and IMARCCOTH().

	* functions.c: Imported the complex functions from the fn-eng
	plug-in.

	* gsl-complex.[ch]: Imported with modifications from the GNU
	Scientific Library (GPLed stuff).