allow snapping to vertex and segment to remove part/ring
use native file selection in new shapefile dialog (implements #9637)
Fix 'geos_c.h not found' build error on Mac
update lib paths for phonon_backends
Added connection pool for SpatiaLite, improving rendering speed within one DB

- refactored PostgreSQL connection pool into generic template classes
- used the template classes for SpatiaLite connection pool
- pooled SpatiaLite connections are opened with SQLITE3_OPEN_NOMUTEX flag to allow parallel access
Merge pull request #1128 from 3nids/removesnapsegment

allow snapping to vertex and segment to remove part/ring
Fix #9641 (broken contrast enhancement)
[Georeferencer] fix bad allocation error
Fix #9396 (datum transform in save as dialog)
Fix #9642 (update overview even if map settings are not valid)
Do not refresh overview twice on a change
Merge pull request #1216 from minorua/georef_bad_alloc

[Georeferencer] fix bad allocation error
[TRANSUP] adding pt_PT translator

Signed-off-by: Werner Macho <werner.macho@gmail.com>
Fix #9643 (overview extent broken)