Moved library code src subdirectory

.gitignore

src/ldapserver/__init__.py

src/ldapserver/asn1.py

src/ldapserver/directory.py

src/ldapserver/dn.py

src/ldapserver/exceptions.py

src/ldapserver/ldap.py

src/ldapserver/sasl/__init__.py

src/ldapserver/sasl/digest_md5.py

src/ldapserver/sasl/external.py

src/ldapserver/schema/__init__.py

src/ldapserver/schema/rfc2307bis.py

src/ldapserver/server.py

src/ldapserver/util.py