Bundle libjasper into Linux package
Rename "None" to "Default" in Parameter's interpolation menu
Tweak strings in "Exclude from Rendering" action
Fix #471: Contour tools should link origins of the layers
Linux build script: Allow to override install prefix using environment variable
Fix #471, Appendix: Keep origin link if exists
Fix crash happening when user selects outline layer (introduced by Zoom handle feature)
Merge pull request #43 from morevnaproject/master

Various fixes for master branch