Fix for several issues (non-working Euro-Option, non-working Referenz-Option, small clitch in date_todo)

Hi there,

the attached patch fixes:

* options without parameters were not put do downcase and therefore not
   found within the option-list. (Euro or DM)
* the "Referenz"-Option within A-Records was completely non-working.
   (code missing to copy the data to the A-record)
* the test for empty date_todo did test for NULL (which always suceeds,
   since the string is preallocated on the stack) instead of a \0-character
   at the beginning.

Please apply, especially point 2 (missing Referenz-Option) is pretty
annoying :)

Cheers,
Peter

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Peter Schlaile