reducing communications in dynspg_ts
we should be able to reduce the number of communications in dynspg_ts when using 2 halos. In particular this lbc may not be needed:
CALL lbc_lnk( 'dynspg_ts', ssha_e, 'T', 1._wp, zhU, 'U', -1._wp, zhV, 'V', -1._wp )
Edited by Nicolas Martin