restructed the code that creates I/O buffers for operations

src/tmltranslator/ctranslator/Buffer.java

src/tmltranslator/ctranslator/DataTransfer.java

src/tmltranslator/ctranslator/FepBuffer.java

src/tmltranslator/ctranslator/MMBuffer.java

src/tmltranslator/ctranslator/MapperBuffer.java

src/tmltranslator/ctranslator/TMLCCodeGeneration.java