Add file system mount script.
update scripts.
check the read requested key is ether assigned to any blocks or not.
add delete on exit flag to set that property to both cache disks and data disks.
modify input client
modify remove method. to keep the payload of removed block.
bug fix. cache disk writing a block.
Add toString method.
Add Placement policy module to Normal and MAID storage.
Fixed several defects.
Add test case of RAPoSDABufferManager.
Adapt buffer region to concurrent processing.
Adapt RAPoSDA buffer manager to concurrent processing.