AqBanking

Fixed a typo spotted by Thomas Bettler (thanks as usual ;-)

Result of "make format".

Minor format changes.

No longer complain about missing BICs.

BICs are no longer required in SEPA transactions. The BIC is also used
if present but a missing BIC should no longer be handled as an error.

Some bank servers might still require the BIC, in that case the user will...

XML-Importer: Fix typo in schema file.

Adapted to latest changes in Gwen (needs current GWEN-GIT!)

XML-Importer: Now autodetects the XML schema automagically.

When using the profile "default" the importer tries to determine the
schema file to be used automatically.

XML: Prepared autodetection of data profiles to use.

AqBanking: Hide class imexporter. Movew convenience functions to AB_BANKING.

Removed another class from the API.
We already had a number of convenience functions both in banking*.h headers
and in imexporter*.h headers. Those have now been moved to banking_imex.h....

Fixed another typo (thanks to Thomas Bettler for spotting).