Vers. 0.3
Fixed button functions when using the plugin several times within the same QGIS
session to import one file after the other -> the button click funtions were
moved to initGui
Added: The user can now also choose the CRS (coordinate reference system) for
the imported tables. Defaulted to ESPG:4326 previously
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Vers. 0.2
The OK button is initially disabled and will only be enabled if a file is
selected for import.
The database connection parameters will now also be checked (same as with the
"Test Connection" button) before the import starts and an error shown if
something is wrong.
