update translation ja include some improvement by Minoru Akagi
Remove diagram_overlay plugin
Clean up code related to old overlay object system
Update new property icons to add whitespace and reduce stroke width

- New icons now match existing icons' characteristics
Change color of remove icon to red, instead of green
Make lock/unlock icon look less distorted and switch to SVG
Update new selection clearing icons

- Rebuild using GIS theme components
- Make yellow RGB values match other selection icons
Switch icons in custom CRS dialog to be more consistent with rest of app
Switch CRS icon to SVG, simplify it, and update using GIS theme components
Switch custom projection icon to SVG and from 'magic wand' to variation of new CRS icon
Switch QGIS Broswer 'set projection' icon to SVG and from 'magic wand' to variation of new CRS icon

- Make browser toolbar icon size honor app's pref
Default raster layer icon for when generation of raster legend layer icons is disabled
debian packaging update
Merge pull request #701 from qgis-jp/make_pull_req_from_ja

update translation ja include some improvement by Minoru Akagi
Merge branch 'master' of https://github.com/qgis/Quantum-GIS into ja_ts_20
execute update_ts_file.sh