This is the prerelease of the new version of FF, version 2.0.  The complex 
routines are being held back, as these are as yet completely untested.  The 
main differences with the normal version are:
- better handling of non-IR masses which are zero (typically neutrinos)
- faster IR divergent boxes using the algorithms of Beenakker & Denner
- B0' (ffxdb0, note that it also returns p^2*B0' to avoid an undefined result 
  for p^2=0)
- the sixpoint function F0
- some tensor functions: B2, D2 (the others will follow)
- hooks for complex functions
- possibility to input the dotproducts (ffxd0d); experimental.
Please report any problems you might have to me, gj@csun.psi.ch or 
t19@nikhef.nl.  Without this feedback I have a hard time killing all bugs.

The calling sequences for internal functions have been changed completely, so 
it is not possible to mix routines from theis version with previous ones.  
Also some error messages have been renumbered, so you cannot even mix the 
ffwarn.dat and fferr.dat files.

Geert Jan van Oldenborgh,
Paul Scherrer Institut,
CH-5232 Villigen PSI,
Switzerland.

Bug fixes:
- 12-07-1991: inconsistent flagging in ffxc0p.f and ffxdi.f caused undefined 
  arguments to be used in some cases.  l4also=.FALSE. helps, or the new files.
- 15-07-1993: better error messages in case of dependent momenta.
- 19-07-1993: fixed typo in ffzdbd which caused ffzzdl to be called with one 
  argument too many.  new file ffzdbd.f
- 12-10-1993: ffxc0 gave a spurious error when called with 3 spacelike momenta
- 1-dec-1993: fixed many problems with the error system, for the time being 
  only in the routines with real masses.  Added B2.  B1' arguments changed!
  Also added the possibility to input the dotproducts: ffxd0d, ffxc0d.  Please 
  report problems with this scheme if you use it.  Fixed bug in B0' for 
  xp=0.
- 1-dec-1993.  AA routines added (tensor reduction).  The B-reduction is now 
  completely stable; I am working on the other ones.  Note that instabilities 
  in the aa routines are not yet reported.  B1' still missing.
- 1-dec-1993.  As the new ff.h file is different from the old one you'll have 
  to recompile everything.
- 2-dec-1993.  Further cleaning in the error reports.
- 18-jan-1994.  Fixed a few typos in ffzb0 (file ffcb0.f), wrong # of args.
- mrt-1994. Fixed a bug in ffxb0 which caused spurious error messages when 
  lwarn was off.
