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Foreign key support

Fix bug when deleting modified features.

Adds test case for the bug.

Adds partial checkout of postgres working copies.

Migrate to use gdal version > 2

This version is not compatible with 1.x versions of gdal.

Fix duplicate key-val error on large updates (see #54)

• fix PK issues on tables not owned by user
• fix massive updates of millions features (/!\ truncate instead of delete)
• fix issue with spaces in path

• adds packaging and test scrips
• fix missing ui file in package

• (subset) users can select a subset of features before checkout (only for spatialite)
• (teamwork) added information to the author field in the revisions table : OS:os_username.pg_committername.pg_authorname; a committer can choose the name of the author; OS info added for auditing purposes; for commits from PG working copies pg_authorname is skipped because it is the same as pg_committername
• (view) the view dialog was revamped : checkboxes make it clear what revisions are to be retrieved; added progress bar and info messages
• (icons) icons were modified to be more in line with other QGIS icons
• (commit, update, working copies) various UI changes : revision numbers updated faster; better messages to the user; relative filename for spatialite (not the full path)
• (other) redirected stdout for windows to avoid "IOError bad file descriptor" errors

Added support for spatialite 4.x

Minor bug fixes.

First release.