corrected buffer fields names

src/tmltranslator/ctranslator/CwaMEC.java

src/tmltranslator/ctranslator/CwlMEC.java

src/tmltranslator/ctranslator/CwmMEC.java

src/tmltranslator/ctranslator/CwpMEC.java

src/tmltranslator/ctranslator/FftMEC.java

src/tmltranslator/ctranslator/SumMEC.java