#19 vCalendar file in/output, or psion 5 support :)

[Jan-Jaap Hendrickx]

Would be nice to have a option to "sync" to a vCalendar
file.

Or direct support of psion er5 :).

But it is possible to go from en to a vCalendar file
with the psion, so a vCalendar file out/input with
merge would be great.