Rename from YdxfPutGrpCodVal to YdxfPutBuffer.
Rename from YdxfGetGrpCodVal to YdxfGetBuffer.
Rearrange package names.
Fix comment.
Set get thread priority higher.
Remove unused code.
User Interface - phase 1.
Rename class.
Rename output thread class.
Set get thread priority higher. IO class rearrangment. Rename input thread class.