Fix lslib and number of atoms in MOLECULE.OUT
Revert the introduction of OnMaster as optional arguments to lsinit_all and lsfree_all of commit 6e22e560. This fixes random LSlib fails as OnMaster was left uninitialized on return from lsinit_all.
OnMaster is output from lsinit_all and specifies if you are on the master or one of the slave nodes. It is input to lsfree_all.
This should have been two MRs, but I still think it is fine to include a minor fix for MOLECULE.OUT for when the input molecule consists of several blocks of the same atomic type