really get only amino acid in getOnlyAminoAcidSequence

src/core/project.cpp

src/core/project.h

src/files/fastafile.cpp

src/files/fastafile.h

src/output/ods/infosheet.cpp

src/output/xpip.cpp

src/utils/fastafilestore.cpp

src/utils/proteinstore.cpp

src/utils/proteinstore.h