how update dipole with integrate npt/sphere

thanks a lot
I am waiting that this change adds as soon as possible to the upstream
LAMMPS version for windows .

​FYI, i've just posted new windows binaries at ​ that support the "update dipole" flag
with the fixes nvt/sphere, npt/sphere, and nph/sphere). the migration into
the upstream LAMMPS source code will take some more time, though.