This will allows to use it for several different external method
calls

- a list of repositories to synchronize can be provided
- the first repository is used for software
- transfer project revision with string like
  [repo x]=[commit count x]-[hash x],[repo y]=[commit count y][hash y]
- change related to new structure :
  recipe slapos.recipe.erp5testnode is inside slapos.cookbook egg
- allow authentification setting for several repositories
- drop support for svn

Mostly formatting changes and few obvious mistakes.

Same as 0526e075
but keeping erp5testnode because it will go back into this repository.

SlapOS code has been moved to: http://git.erp5.org/gitweb/slapos.git

Increment since most recent (incremental OR full) backup. Thanks to this
incrementals are deltas between them, but still the newest full would be used
in case if it is more recent then last incremental.

This reverts commit eac0cc35.

gcc is "incompatible" from version to version in accepted parameters.

There is no rule to put install in /usr/bin.