[processing] some fixes in help system
[processing]improved script editor dialog
[processing] added Chainage algorithm as script
[processing] added new example script
[processing] fixed v.select description

fixes #10113
[processing] fix typo in GRASS 7 provider
fix crash when maptool of a plugin is active on exit
QgsField::displayString() consider configurable NULL representation
identify: fix form button icon & tooltip, remove close button
Fix extent computation in memory provider
follow up e4f410b58
[TRANSUP] pl: OptionsBase; iss 6,8,9,13 by Radek
Merge pull request #1329 from Cracert/i18n

[TRANSUP] pl: OptionsBase; iss 6,8,9,13 by Radek
[composer] Recalculate table size when margin or grid width changes
Fix crashes with parallel access to GRASS vectors
debian packaging: depend on python-pyspatialite on trusty
[db manager] shows vertical scrollbar as needed and set focus to the query editor after clearing
[TRANSUP] fi by Kari

Signed-off-by: Werner Macho <werner.macho@gmail.com>