Fix AbstractTransfer
Fix Multiple Transfer (run)
Add SpooledDirectoryTransfer
Add LogImport and options to LogExtendedExport to download then import
Add SpooledDirectoryTransfer
Fix Null String in DbTaskRunner
Fix EndTransfer error not correctly set for size or hash error
Fix CPULimit handling (no usage was not correctly setup)
Fix file size in transfer initialization
Add MariaDB support
Fix Java Task
Fix DB initialization
Fix issue on ConstraintLimitHandler
Fix Issue on Multithread access to one JDBC Connection for MySQL and
MariaDB
Fix Issue on Full/relative path while all are relative
Fix Json support using class as support
Merge pull request #71 from fredericBregier/2.4

2.4.18
Merge pull request #72 from waarp/2.4

2.4.18 final version