[processing] Add crs selection panel to scripts
[processing] R improvements

This commit:

Deletes Example scripts

Replaces Example scripts with more up to date versions

Adds general categories for r scripts: Basic statistics, Vector processing, Raster processing and Point pattern analysis

adds help files to all r scripts

Adds a groups of r scripts entitled Home range analysis, that includes Kernel href, LSCV Kernel, Minimum convex polygon, single linkage cluster analysis and characteristic hull method, using adehabitatHR()

Adds the following R scripts contributed by Yury Ryabov ( riabovvv(at)gmail.com ): Advanced raster histogram, Monte carlo spatial randomness, Relative distribution (distance covariate), Relative distribution (raster covariate),
[georeferencer] does not ask for output file when word file checkbox is checked
- restore settings for word file checkbox
[georeferencer] change add raster icon to be consistent with the main app theme
[globe] Make OSG_PLUGINS_PATH CMake option functional on Mac
Merge pull request #986 from p0cisk/processing_crs

[processing] Add crs selection panel to scripts
[FEATURE] leave backup when saving projects
[globe] Fix extent synchronisation
Add missing license headers
Fix bug in datum transform sync
[globe] Re-Enable sync extent button and disable home button
The home button was a duplicate of the globe in the center of the
navigation arrows
In case PROJ_LIB is set, disable grid shifts if .gsb file are not there
translation update: hindi new maintainer
fix in name of translator
add missing actionFeatureAction() to gui and sip
Return expression string from QgsExpression::expression(). Don't use ::dump()
spatialite: update more infinite where clauses (followup 371f9ba17)
ogr provider: actually only use relevant fields in feature iterator (fixes #9062)
Merge remote-tracking branch 'upstream/master' into Issue_8725-OGR