Fixed: transaction description field does not proceed to next input on clicking "next" (closes #116)
Sorted sub-accounts in alphabetical order
Use full qualified account names in WidgetConfigurationActivity dialog
Prevent setting an account's parent to one of it's children
Added support for placeholder accounts (closes #113)
Placeholder accounts do not allow transactions to be added to them.
They will also properly be detected during import of the GnuCash account structure
Filter out placeholder accounts from double account spinner field