Added functions to read epochs, get components and plot components from fitsfiles.

	modified:   ../../../share/isisscripts.sl
	modified:   ../../../share/isisscripts.txt
	get_component.sl
	plot_component.sl
	read_ep.sl

Author:    Christoph Grossberger <christoph.grossberger@sternwarte.uni-erlangen.de>
Committer: Christoph Grossberger <christoph.grossberger@sternwarte.uni-erlangen.de>