More descriptive name "MPE_hello" for old src/fun/.

diff --git a/src/fun/.make_tar b/src/MPE_hello/.make_tar
similarity index 100%
rename from src/fun/.make_tar
rename to src/MPE_hello/.make_tar

diff --git a/src/fun/Makefile b/src/MPE_hello/Makefile
similarity index 100%
rename from src/fun/Makefile
rename to src/MPE_hello/Makefile

diff --git a/src/fun/Makefile_XPHY b/src/MPE_hello/Makefile_XPHY
similarity index 100%
rename from src/fun/Makefile_XPHY
rename to src/MPE_hello/Makefile_XPHY

diff --git a/src/fun/Makefile_old b/src/MPE_hello/Makefile_old
similarity index 100%
rename from src/fun/Makefile_old
rename to src/MPE_hello/Makefile_old

diff --git a/src/fun/Makefile_original b/src/MPE_hello/Makefile_original
similarity index 100%
rename from src/fun/Makefile_original
rename to src/MPE_hello/Makefile_original

diff --git a/src/fun/fun.c b/src/MPE_hello/fun.c
similarity index 100%
rename from src/fun/fun.c
rename to src/MPE_hello/fun.c

diff --git a/src/fun/fun.h b/src/MPE_hello/fun.h
similarity index 100%
rename from src/fun/fun.h
rename to src/MPE_hello/fun.h