Stop use of mr.developer (source available on git now).

Use relative paths. Cleanup.

software/beremiz-runtime/software.cfg

-# the default SlapOs profile which setup a modbus server instance usually over OSIE's coupler
 [buildout]
-allow-picked-versions = true
-extensions = mr.developer
-auto-checkout = beremiz
 extends =
   buildout.hash.cfg
-  https://lab.nexedi.com/nexedi/slapos/raw/master/stack/monitor/buildout.cfg
-  https://lab.nexedi.com/nexedi/slapos/raw/master/stack/slapos.cfg
-  https://lab.nexedi.com/nexedi/slapos/raw/master/component/python3/buildout.cfg
+  ../../component/git/buildout.cfg
+  ../../stack/monitor/buildout.cfg
+  ../../stack/slapos.cfg
 
 parts = 
-  python-interpreter
+  beremiz-source
   slapos-cookbook
   instance-profile
+  python-interpreter
 
-# fix for pypi: https://mail.python.org/pipermail/distutils-sig/2017-October/031712.html
-index = https://pypi.python.org/simple/
-
-[sources]
-beremiz = git https://github.com/beremiz/beremiz.git branch=default
+[beremiz-source]
+recipe = slapos.recipe.build:gitclone
+repository = https://github.com/beremiz/beremiz.git
+branch = default
+git-executable = ${git:location}/bin/git
 
 [beremiz]
 recipe  = zc.recipe.egg:develop
 egg     = beremiz
-setup   = ${buildout:directory}/src/beremiz
+setup   = ${beremiz-source:location}
 
 [Twisted]
 recipe  = zc.recipe.egg:custom
@@ -31,6 +28,7 @@ egg     =  Twisted
 setup-eggs =
     six
     pathlib
+    incremental
 
 [python-interpreter]
 recipe = zc.recipe.egg
@@ -53,7 +51,6 @@ eggs = click
 [instance-profile]
 recipe = slapos.recipe.template:jinja2
 template = ${:_profile_base_location_}/${:filename}
-mode = 0644
 rendered = ${buildout:directory}/instance.cfg
 extensions = jinja2.ext.do
 context =
@@ -95,4 +92,3 @@ typing = 3.10.0.0
 autobahn = 19.11.2
 txaio = 18.8.1
 idna = 2.10
-mr.developer = 2.0.1