Reviewed-by: TrustMe

The old address is no more:

    $ wget http://www.complang.org/ragel/ragel-6.8.tar.gz
    --2015-06-12 12:22:55--  http://www.complang.org/ragel/ragel-6.8.tar.gz
    Resolving www.complang.org (www.complang.org)... 192.155.89.46
    Connecting to www.complang.org (www.complang.org)|192.155.89.46|:80... connected.
    HTTP request sent, awaiting response... 404 Not Found
    2015-06-12 12:22:55 ERROR 404: Not Found.

because Ragel project moved to http://www.colm.net/open-source/ragel/

Adjust the download url properly.

/cc @cedric.leninivin
/reviewed-by: TrustMe

This reverts commit 00ccb27d.

MDEV-6449 was fixed in version 10.0.14
Note however that TokuDB remains automatically disabled when building MariaDB
with GCC < 4.7

For NEO, TokuDB seems to be a better choice than InnoDB.

rpy2 loads r libraries from this directory

Because git is used in `python setup.py sdist`

    https://lab.nexedi.cn/nexedi/wendelin.core/blob/11d130d1/setup.py#L168

we need to make sure it is available at runtime (at time when sdist
happens), or else installation could fail.

Since zc.recipe.egg:develop now supports setting environment variables

    https://lab.nexedi.cn/nexedi/slapos.buildout/commit/93d35f5d
    https://lab.nexedi.cn/nexedi/slapos.buildout/commit/71078537 )

and we use the proper version of it in slapos stack:

    https://lab.nexedi.cn/nexedi/slapos/commit/d0807d90

we can just set environment with git being in PATH and fix it this way.

/cc @Tyagov, @kazuhiko, @jerome
/reviewed testbot(building ok), trustme

This reverts commit bf75e8a9.

also parallel build becomes possible again.

This checks if a certain parameter is the write one, normally it is required to know
if the value is not published but not yet ready.