also begin to migrate the configuration layout

Signed-off-by: Nico Schottelius <nico@kr.ethz.ch>

doc/man/cdist-config-layout.text

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+On the server:
+
+conf/manifests/init
+   - the central entry point
+   - is a shell script
+   - defines mapping from types to hosts
+   -  will be called by cdist and the name
+      will be available for tracking in
+      cdist core functions
+
+conf/manifests/* (all other)
+   - same function as above
+   - but won't be called by cdist
+   - method to seperate configuration parts
+
+
+conf/types/<name>/
+   - provide standard types
+   - have required and optional arguments
+   - are independent of hosts
+   - may make use of other types to realise a new type
+      - how to overwrite stuff?
+      - overwrite in own tree?
+         - needs knowledge of inherited provider
+            - similar to current situation in puppet,
+              but more like reusable defines
+   - or may implement some functionality on their own
+
+conf/explorers/<name>
+   - explorers to be run on the target hosts
+
+Differences manifests vs. types
+
+
+                     manifests               types
+
+main purpose         map config to host      provide functionality
+can change config    no (prevent conflicts)  yes (allow inheritance)
+specificness         site specific           (globally) reusable