Installation instruction for the FONLL code.

The code has been developed on a Linux system. It should also work on
othe Unix platforms. You need GNU make. The CERN library are
needed if you want to use the PDFLIB package.

- Change to the directory FONLL/Linux (or to another directory you created)

- Execute makefonll to compile and link the executable (fonll)
- makefonllpdl links instead to the PDFLIB package from the CERN libraries
  rather than to the library that comes with FONLL (hvqpdfpho), and 
  creates the executable fonllpdl
  
- execute FONLL/pdfdata/linkpdf.sh in the directory from where you intend 
  to run the fonll executable. This creates links to the PDF datafiles 
  needed by hvqpdfpho.f
  
- the shell tests.com in FONLL/tests executes a few test runs. It takes
  about 8 minutes on a Pentium III 866 MHz and about 5 minutes on a 
  Pentium 4 1.7 GHz (with gcc-g77 2.96). Its output (testfonll.outlog) can 
  be compared to the file testfonll.outlog-vX.X. 
  In order to run, tests.com creates in its directory the links to the 
  PDF datafiles by running FONLL/pdfdata/linpdf.sh  
  These links and other auxiliary files are deleted at the end of the run.
  NB: the file .outlog is not erased at the begining of a run. If you run 
  the code twice with the same filename tag you'll find both outputs in 
  there.
