[daip] PBEAM

[Leonia Kogan]

Rick,

I have fixed the PBEAM's problem. 
PBEAM has not worked with the polinom degree >3 only for such a long 
wavelength as meters.
The beam becomes very wide and as a result the elements of matrice 
prepared for the least square exceed the limit (for REAL) 2**128~10**42.

So I swithed the relevant variables to DOUBLE PRECISION and wrote the LEAST
SQUARE routine with Double precision inputs/outputs.

The new version is in the system and will be available tomorrow through
MNJ.

Leonia