- use m prefix for member variables and s prefix for class variables
- refactor QgsPostgresProvider::Conn and QgsPostgresConnection to QgsPostgresConn
- put QgsColumnTypeThread into separate file
- use QgsPostgresConn in QgsPgSourceSelect
- cleaner abort of column type thread (e.g. remove unfinished columns from
  selection list)
- [API] move QgsDbTableModel as QgsPgTableModel to provider
- [FEATURE] support for arbitrary key (including non-numeric and multi column)
- [FEATURE][API] support for requesting a certain geometry type and/or srid in QgsDataSourceURI
 * no more explicit filter strings
 * support for empty tables without gemetry_columns entry or GEOMETRY type.

- base geometrytype filtering on GeometryType not WkbType
- use tooltips on dataitems
- fix #4783
- adapt #4767

- add a column containing the feature id, if no columns are there (otherwise
  there are no valid model indices)
- vector layer: emit featureDeleted and featureAdded signals, when added
  features change their temporary to a permanent id (e.g. makes the now defunct
  rows in the attribute table disappear, instead of showing ERROR)
- memory provider: update the feature id in added features

…pty PG table

[API] introduce signal QgsVectorLayer::geometryChanged() signal and use that
to reduce the need to reload the modified geometry.

- push commit errors in PostgreSQL, OGR and SpatiaLite provider
- add provider errors to commit error
- postgres provider: improve handling of geography columns

- disable "Add" in selection dialog while column type thread is running
- fix detection of integer keys
- when adding feature update attributes and feature id in passed features

- make geometryless table selectable
- only make srid column editable when necessary
- leave primary key column editable
- require primary key selection for views

Richard Duivenvoorde (from pull request #78)
- crs taking into account, bookmarklist is now editable qtreeview
- set better column names the column names from the table

Juergen Fischer added refactoring:
- move adding bookmarks into QgsBookmarks
- make QgsBookmarks a singleton
- delete multiple entries at once

 #4909)

- pre-select first integer column as primary key for views
- also consider oid type as integer column

…ixes #4998 and #4999)

- fix primary key detection, if column is behind geometry column
- add support for varchar length limits

…he source layers