either show timespan input or time edit textbox
Check wether database version is to new.

Show a popup message asking the user to upgrade. Abort loading of the
plugin.
Add popup window to select the reoccurrence behavior of timers
Set button checkstate as specified by the current reoccurrence setting.

emit signlal with new selection if ok button is pressed in the
selectreoccurrence window.
Add column 'reoccurrence' to teatime database table

also save/load reoccurrence data to/from db
Made reoccurrency setting available to theme as human readable string
only change the reoccurrence buttontext if we have valid data.