Timelink

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* Add model for RealEntiy, imports Real Entities (sameas and authority records).
22, 21 (only Real Entities)
* Improve rendering of extra_info in Kleio
* Removes Kleio-home from path when storing Kleio files 20
* Fixes problem with checking length of content for numeric fields 54
* Implements 53 facilitates access to ORM models using group names.

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* Improves import when tables duplicate columns of super class table, bug fixes.
* Fixes issue 49: now import propagates data to higher levels in table hierarchy, even if the data is not mapped in the lower levels.
* Fixes 44: get_person and get_entity now accept db and session as parameters
* Improves rendering of automatic ids.

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* Fixes issue 48: now import propagates data to higher levels in table
hierarchy, even if the data is not mapped in the lower levels.

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* Implements Issue43 (adds groupname filtering to attribute_values)
* Fixes bug in pandas.styles due to deprecation of matplotlib.cm
* Fix a problem with the release process.

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* Fix a bug in entities_with_attribute() filter_by parameter handling.

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* fix bug with to_kleio() in models (bad identation)