version up : zc.buildout 1.6.0-dev-SlapOS-013.
remove explicit dependency declarations.

zc.buildout >= 1.6.0-dev-SlapOS-013 automatically rebuilds parts whose referring parts are modified.
version up : MariaDB 10.0.13.
version up : curl 7.37.1.
version up : percona-toolkit 2.2.10.
version up : git 2.0.4.
version up : libpng 1.6.12.
version up eggs.
specify setuptools version in stack/slapos.cfg only.
version up : setuptools 5.5.1.
fix a typo.
cloudooo : version up eggs.
add software/erp5/software-erp5-component.cfg.

so that we don't need to differentiate software/erp5/software.cfg in erp5-component branch.