Add autocentering of overview

Work funded by Tuscany Region - SITA. Contract "Support to the use
of GFOSS (Geographic Free and Open Source Software) Desktop tools"
(CIG Z3B06FA6D7).
Add unit test for autocentering of overview

Work funded by Tuscany Region - SITA. Contract "Support to the use
of GFOSS (Geographic Free and Open Source Software) Desktop tools"
(CIG Z3B06FA6D7).
Add SIP and Python unit test for overview autocentering.

Work funded by Tuscany Region - SITA. Contract "Support to the use
of GFOSS (Geographic Free and Open Source Software) Desktop tools"
(CIG Z3B06FA6D7).
Fix overview autocentering: always center, not only when the overview is not visible.

Work funded by Tuscany Region - SITA. Contract "Support to the use
of GFOSS (Geographic Free and Open Source Software) Desktop tools"
(CIG Z3B06FA6D7).
Add an update of overview on centering mode switch
- script to generate a database to reproduce the bug
- no crash observed with qgis natural breaks (jenks)
- added warning and chance to cancel Natural break classification for
  dataset >50k records
- modified test script to generate gowing sizes tables (for timing)
commit
Fix #6063
Fix #6063
refs #8045 Add unit tests for path passed from command line
refs #8045 Fix the way main() parse path names with special characters
refs #8045 Fix python plugin path encoding issues
fix distance matrix k and k-1 issue
[ftools] add warning for simplify tool when no one layer has been selected
If ignoreShapeEncoding is false, clear SHAPE_ENCODING after creating shapefile with SHAPE_ENCODING="" (fix #8440)
Spit: apply SHAPE_ENCODING to shape layer opening
Make sure updateFields() is called before setDisplayField for new vector layers (fix #8311)
Fix indexOf checks in setDisplayField, make sure they are case insensitive
Untranslatable strings and formatting of the raster min/max label
Fix untranslatable tooltip in project properties.