When a transaction is added from the ledger, price database is updated properly.
But if the transaction is imported, there is no price db update.
This change adds the proper pricedb update in the import path (qfx/ofx/qif).
Tested with make check
A type conversion function is introduced for each GObject mockup. This
function does a runtime type check and generates a GoogleTest failure in
case of any type error. This avoids checking GObject type twice.
According to a remark in PR #738 the lower case type name is changed.
Underscores should only be used between namespace and type name and
between type name and suffixes.
