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Fix for bug which caused entries not to sync under certain conditions; preparations for account management

Signed-off-by: pianomister <stegiemail-github@yahoo.de>
Merge branch 'master' of https://github.com/pianomister/ExpenSync
Account management completed; adapted total balance calculation

Signed-off-by: pianomister <stegiemail-github@yahoo.de>
Merge pull request #2 from pianomister/master

Category and account management, bugfixes, minor enhancements