Fix for Issue #88 - ZMS crashing

Previously, systems without gnutls were computing auth_md5 to be twice the size of what it was defined to be, thus causing zms to crash. The for loop at line 227 builds auth_md5 by looping every "2j", which means the upper limit (md5len) should be half the desired size of auth_md5.
Merge pull request #90 from knnniggett/patch-8

zms crashes with hashed authentication - fixes #88

Previously, systems without gnutls were computing auth_md5 to be twice the size of what it was defined to be, thus causing zms to crash. The for loop at line 227 builds auth_md5 by looping every "2j", which means the upper limit (md5len) should be half the desired size of auth_md5.