Incomplete storage/handling of XML date

[pasimo]

An attribute of type "date" is defined with minimum/maxium as follows (e.g. 1900-01-01): Field 1 (year): 1900 Field 2 (month): 01 Field 3 (day): 01

When the date is stored using "Übernehmen", after closing and reopening the attribute specification dialogue, the result looks like this: Field 1 (year): 1900 Field 2 (month): 1 Field 3 (day): 1

For the month and day the leading "0" digit has disappeared and the result after exporting the ili file results in an incomplete XML date 1900-1-1

[claeis]

in the umleditor, the values are numbers (leading zeroes have no meaning). But see #60 for a "fix".