Revision 229

Use iflag_pbl from module conf_phys in yamada4 instead of getting it
as argument.

In clvent, simplifications using the fact that zx_alf2 = 0 and zx_alf1
= 1 (discarding the possibility to change this).

In physiq, no need for temporary variables z[uv]strph: compute actual
arguments of aaam_bud directly.