Add saving of reports.

[Christian Stimming]

Log Message:
-----------
Add saving of reports.

2004-06-18  Christian Stimming  <stimming at tuhh.de>

	* src/scm/main-window.scm, src/scm/main.scm: Added example Menu
	item "File -> Save all reports" that will call the new report
	saving function for all reports. Reports are appended to
	~/.gnucash/saved-reports-1.8 . This would need more work so that
	not all reports are saved but only the currently selected one --
	any volunteer may feel free to add that.

	* src/report/report-system/report.scm, report-system.scm: Added
	gnc:report-generate-saved-forms that will generate the scheme code
	necessary to create a new report from the saved options of an old
	report (merged from 1-8-branch).

Modified Files:
--------------
    gnucash:
        ChangeLog
    gnucash/src/scm:
        main-window.scm
        main.scm
    gnucash/src/report/report-system:
        report-system.scm
        report.scm