Import data from external source

[luboA]

I can't find any mention about import functionality. I would like to import time tracking data in CSV format. This functionality should be on simple CSV in format Date,TimeFrom,TimeTo,Duration,IssueName,Note . At least two valiation should be done:

1. Valid for duplicities (also with data in timetracker)
2. Valid for the same values if TimeTo and Duration is defined (there should be defined just one of them but if both are defined, we need this validation)

Format on Date,TimeFrom/TimeTo and Duration can be defined from your side (maybe hardcoded, but it doesn't matter).

I will appreciate to implement this feature.

PS: Yes, we don't need both columns TimeTo and Duration, just one of them, then second validation is not necessary.