Release 0.20.0.

Updated changelog.

Added changelog entries, bumped version to 0.19.0.

Release 0.18.4.

Changed shortcut for GDAL import.

Was conflicting with the standard import.

Remove the now unused function loadFiles.

Added spatialite information into CHANGELOG and INSTALL.

v0.18.1

v0.18.0

0.17.2 release