update /doc directory with latest from leap docs/platform

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+@title = "couchdb"
+@summary = "Data storage for all user data."
+
+Topology
+------------------------
+
+Required:
+
+* Nodes with `couchdb` service must also have `soledad` service, if email is enabled.
+
+Suggested:
+
+* Nodes with `couchdb` service communicate heavily with `webapp` and `mx`.
+
+`couchdb` nodes do not need to be reachable from the public internet, although the `soledad` service does require this.
+
+Configuration
+----------------------------
+
+### Nighly dumps
+
+You can do a nightly couchdb data dump by adding this to your node config:
+
+    "couch": {
+      "backup": true
+    }
+
+Data will get dumped to `/var/backups/couchdb`.
+
+### Plain CouchDB
+
+BigCouch is not supported on Platform version 0.8 and higher: only plain CouchDB is possible. For earlier versions, you must do this in order to use plain CouchDB:
+
+    "couch": {
+      "master": true,
+      "pwhash_alg": "pbkdf2"
+    }
+
+Various Tasks
+-------------------------------------------------
+
+### Re-enabling blocked account
+
+When a user account gets destroyed from the webapp, there's still a leftover doc in the identities db so other people can't claim that account without an admin's intervention. You can remove this username reservation through the webapp.
+
+However, here is how you could do it manually, if you wanted to:
+
+grep the identities db for the email address:
+
+    curl -s --netrc-file /etc/couchdb/couchdb.netrc -X GET http://127.0.0.1:5984/identities/_all_docs?include_docs=true|grep test_127@bitmask.net
+
+lookup "id" and "rev" to delete the doc:
+
+    curl -s --netrc-file /etc/couchdb/couchdb.netrc -X DELETE 'http://127.0.0.1:5984/identities/b25cf10f935b58088f0d547fca823265?rev=2-715a9beba597a2ab01851676f12c3e4a'
+
+### How to find out which userstore belongs to which identity?
+
+    /usr/bin/curl -s --netrc-file /etc/couchdb/couchdb.netrc '127.0.0.1:5984/identities/_all_docs?include_docs=true' | grep testuser
+
+    {"id":"665e004870ee17aa4c94331ff3ecb173","key":"665e004870ee17aa4c94331ff3ecb173","value":{"rev":"2-2e335a75c4b79a5c2ef5c9950706fe1b"},"doc":{"_id":"665e004870ee17aa4c94331ff3ecb173","_rev":"2-2e335a75c4b79a5c2ef5c9950706fe1b","user_id":"665e004870ee17aa4c94331ff3cd59eb","address":"testuser@example.org","destination":"testuser@example.org","keys": ...
+
+* search for the "user_id" field
+* in this example testuser@example.org uses the database user-665e004870ee17aa4c94331ff3cd59eb
+
+
+### How much disk space is used by a userstore
+
+Beware that this returns the uncompacted disk size (see http://wiki.apache.org/couchdb/Compaction)
+
+    echo "`curl --netrc -s -X GET 'http://127.0.0.1:5984/user-dcd6492d74b90967b6b874100b7dbfcf'|json_pp|grep disk_size|cut -d: -f 2`/1024"|bc
+
+
+Deprecated BigCouch Tasks
+-----------------------------------------
+
+As of release 0.8, the LEAP platform no longer supports BigCouch. This information is kept here for historical reference.
+
+### Rebalance Cluster
+
+Bigcouch currently does not have automatic rebalancing.
+It will probably be added after merging into couchdb.
+If you add a node, or remove one node from the cluster,
+
+1. make sure you have a backup of all DBs !
+
+1. put the webapp into [[maintenance mode => services/webapp#maintenance-mode]]
+
+1. Stop all services that access the database:
+
+    ```
+    workstation$ leap ssh soledad-nodes
+    server# /etc/init.d/soledad-server stop
+
+    workstation$ leap ssh mx-node
+    server# /etc/init.d/postfix stop
+    server# /etc/init.d/leap-mx stop
+
+    workstation$ leap ssh webapp
+    server# /etc/init.d/nickserver stop
+    ```
+
+    Alternately, you can create a temporary firewall rule to block access (run on couchdb server):
+
+    ```
+    server# iptables -A INPUT -p tcp --dport 5984 --jump REJECT
+    ```
+
+1. dump the dbs:
+
+    ```
+    cd /srv/leap/couchdb/scripts
+    time ./couchdb_dumpall.sh
+    ```
+
+1. delete all dbs
+
+1. shut down old node
+
+1. check the couchdb members
+
+    ```
+    curl -s —netrc-file /etc/couchdb/couchdb.netrc -X GET http://127.0.0.1:5986/nodes/_all_docs
+    curl -s —netrc-file /etc/couchdb/couchdb.netrc http://127.0.0.1:5984/_membership
+    ```
+
+1. remove bigcouch from all nodes
+
+    ```
+    apt-get --purge remove bigcouch
+    ```
+
+1. deploy to all couch nodes
+
+    ```
+    leap deploy couchdb
+    ```
+
+1. most likely, deploy will fail because bigcouch will complain about not all nodes beeing connected. Let the deploy finish, restart the bigcouch service on all nodes and re-deploy:
+
+    ```
+    /etc/init.d/bigcouch restart
+    ```
+
+1. restore the backup
+
+    ```
+    cd /srv/leap/couchdb/scripts
+    time ./couchdb_restoreall.sh
+    ```
+
+### Migrating from BigCouch to plain CouchDB
+
+<%= render :partial => 'docs/platform/common/bigcouch_migration_begin.md' %>
+
+
+<%= render :partial => 'docs/platform/common/bigcouch_migration_end.md' %>
+
+
+<%= render :partial => 'docs/platform/common/bigcouch_migration_finish.md' %>