Fixed bug#6766 (icalendar.el)

Fixed bug#6766 (icalendar.el)

lisp/ChangeLog:

	* calendar/icalendar.el (icalendar-uid-format): Doc fix.
	(icalendar--split-value): Fixed splitting regexp. (Bug#6766)
	(icalendar--get-weekday-numbers): New
	(icalendar--create-uid, icalendar-export-region)
	(icalendar--parse-summary-and-rest): Code formatting.
	(icalendar--convert-recurring-to-diary): Handle multiple byday
	values in weekly rules. (Bug#6766)

test/ChangeLog:

	* icalendar-testsuite.el (icalendar-testsuite-run): Added internal tests.
	(icalendar-testsuite--trim, icalendar-testsuite--compare-strings)
	(icalendar-testsuite--run-internal-tests): New.
	(icalendar-testsuite--test-convert-ordinary-to-ical)
	(icalendar-testsuite--test-convert-block-to-ical)
	(icalendar-testsuite--test-convert-anniversary-to-ical)
	(icalendar-testsuite--test-parse-vtimezone)
	(icalendar-testsuite--do-test-export): Code formatting.
	(icalendar-testsuite--test-parse-vtimezone): Doc fix.
	(icalendar-testsuite--do-test-import)
	(icalendar-testsuite--do-test-cycle): Use icalendar-testsuite--compare-strings
	(icalendar-testsuite--run-import-tests): Comment added.
	(icalendar-testsuite--run-import-tests)
	(icalendar-testsuite--run-real-world-tests): Fixed expected results.