2000-07-03  Jukka-Pekka Iivonen  <iivonen@iki.fi>

	* src/analysis-tools.c: Implemented `Histogram' tool (mostly).

	* src/dialogs/tools.h: Related changes.

	* src/dialogs/analysis-tools.glade,
	src/dialogs/dialog-analysis-tools.c: Added dialogs for `Histogram'
	and `Fourier Analysis' tools.  The later is not implemented yet.