Fixes: eod storage in hdb of tables not having sym column fails with length error

[strikeout]

rdb expects the column 'sym to be available in every table (this is also a constraint of the tickHF so usually is not a problem).

When using the dist component instead of tickHF to publish to the rdb, tables without 'sym column break the eod write to the hdb with a 'length error.

The .stor library was prepared for that case and looks for a column 'attrCol for customisation of the column the table gets partitioned by.
The rdb does not provide that column by default, so every table automatically defaults back to 'sym.

This PR fixes that issue and just enables you to pass the definition of the table, the hdb should partition by on eod in dataflow.cfg

[table:Accounts]
    model = accountID(INT), name(STRING), email(STRING), date(TIMESTAMP)
    template = something
    [[core.rdb]]
      attrCol = date