cygwin: fixed URL after 64bit release

util-linux, apr-util, rdiff-backup, apache
mysql-5.5, stunnel, openldap, libpng
openldap: added libdb component for cygwin + explicit dependency
resdemo SR (clone of wordpress for now)
logrotate: put back PREFIX value in 'make' call
resdemo: minimal relient profile
fixed trailing / in nofifier-url
backup every 10 minutes
logrotate: PREFIX/INSTALL in environment, librsync: from cygwin package
resdemo: removed mysql-python dependency
resdemo: develop slapos.core; check-recipe