This is a minimum build structure for building and using fvn

1) Clone the following repositories : fvnbtree, atlas, fvn 
1) Setup environment variable BTREE to point to the fvnbtree directory
2) copy file Make.inc.gfortran.atlas to Make.inc
3) read the comments and adapt Make.inc to your needs
4) go to atlas directory and follow instructions, after the 
"make install", atlas libraries will be in $BTREE/lib
5) go to fvn directory and do "make" the "make install"
6) go to fvn_test, and type "make", this should build the example programs.