Current configuration was not using site.zcml, now it is fetched from
zope.

Provide simple way of package activation.

Install z3c.deadlockdebugger with required dependency and activate it if
required.

This reverts commit d64008dd.

Unfortunately innobackupex manual page lied about possibility to pass
directly path of backup agent, so it is required to rely on PATH
manipulation.

Because https prompts buildout process, use http instead

runUnitTest finding all tests

It is possible to tell to innobackupex full path of backup agent, and as
explicit shall be preferred, use such way.

zerokspot.recipe.git calls git binary, but it is not possible to control
on part level which git shall be used.

internal to the repository)

Moreover use SlapOS patched buildout functionality in order to have
local/remote usage.

Moreover slapos buildout patches are used to fetch them
locally/remotely.

This tool allow to have hot backups of mysql. innobackupex is referred
directly, but xtrabackup_51 is just linked into instance bin directory,
which will be later passed in environment.