From Ulf Jasper <ulf.jasper@web.de>:

From  Ulf Jasper  <ulf.jasper@web.de>:

Set coding to utf-8.
(icalendar-version): Increase to 0.07.
(icalendar-monthnumber-table): Change March pattern.
(icalendar-get-all-event-properties)
(icalendar-set-event-property): Delete.
(icalendar-all-events): No longer interactive.
(icalendar-convert-diary-to-ical)
(icalendar-extract-ical-from-buffer): Make obsolete, and alias to
their replacements.
(icalendar-export-file, icalendar-export-region): New functions;
essentially old `icalendar-convert-diary-to-ical' but appending to
target rather than overwriting.
(icalendar-import-file): Append to target file rather than
overwriting.  Fourth arg deleted.
(icalendar-import-buffer): New name for old
`icalendar-extract-ical-from-buffer'.
(icalendar--convert-string-for-import): New name for
old `icalendar-convert-for-import'.
(include-icalendar-files): Delete.
Prefix for all internal functions changed from `icalendar-'
to `icalendar--'.