master: also write the datafile as SQL

Starting the Storable -> SQL conversion, created a
munin_writeconfig_sql() that is launched at the end
master: integrate the name in the sql schema
master: using an external seq() function
master: add a 'type' field for nodes
master: use "object" as table name

"node" was misleading, object is much more neutral
master: use PRAGMA journal_mode=OFF

We do not care about rollbacks yet. It is still a full DB write each
time.
master: use PRIMARY KEY directly
master: use the storable on old config
master: added "ignore" as value for use_node_name

This enables to just ask for the the default node, like what you
have when you ask with "list "

It avoids completely the node name mess, and just do what you think
it will do.
master: adding the type of the node
master: adding a dump for $self in M::M::Update
master: rewrite the SQL layer --> natural schema
master: using last_insert_id() for automatic keys
master: import the rest of the data
dev_scripts: adding a textual dump for the sqlite DB
dev_scripts: removed data. say filename
master: adding foreign keys
master: remove munin_writeconfig_sql()

It is not needed anymore, since a higher-level dump is done.
dev_scripts: only emit the filename

This is to enable something like :

    vi $( dev_scripts/dump_sql )
master/Update: reuse the std dump function