- Improve versioning of the plugins.
- Some bug fixes.

1999-12-29  Jody Goldberg <jgoldberg@home.com>

	* src/workbook-view.c (command_context_gui,
				gui_splits_array,
				gui_plugin_problem,
				command_context_gui_cast) : New functions.

	* src/workbook.c (workbook_new) : Switch to using the workbook_view
	  routines to manipulate the undo/redo and paste/paste_special menu
	  items.

	* src/func.c (function_iterate_argument_values) : Return an error
	  for empty/missing arguments.

	* plugins/*/Makefile.am : Define GNUMERIC_VERSION.

	* plugins/*/*.c (init_plugin): Take a CmdContext for error reporting.
	  Call plugin_version_mismatch to do some minimal version matching for
	  plugins and the running application.

	* src/Gnumeric.idl : Add PluginProblem.

	* src/command-context.[ch] (gnumeric_error_splits_array,
				    gnumeric_error_plugin_problem,
				    command_context_vtbl_init) : New functions.

	* src/plugin.c (plugin_version_mismatch) : New function.
	  (plugin_load) : Hard code a GUI context for now.
	                  Switch to using gnumeric_error_ routines.
			  Pass a CmdContext to the init_plugin routines.
			  Only produce an error if the plugin returns -1.
			  Store the plugin filename.
	  (plugin_unload) : Free the filename on exit.

	* *.c : command_context_gui now takes a Workbook argument.
	      : Switch from gnumeric_no_modify_array_notice
	                 to gnumeric_error_splits_array in most places.