Updated MANIFEST.in for new directory structure

MANIFEST.in

@@ -1,16 +1,6 @@
-include Ngl.pth
 include setup.py
-include README
-include INSTALL
-include Ngl.py
-include __init__.py
-include Helper.c
-include gsun.c
-include gsun.h
-include hlu.i
-include hlu.py
-include hlu_wrap.c
-include sysresfile
+include README.md
+include data/sysresfile
 include version
-recursive-include paft *.c
+recursive-include src *
 recursive-include examples *.py *.res