change Log4j -> logback + related changes
log acess to null configuration items
Merge pull request #136 from maiklos/2.1.2

2.1.2
further work on the feature suggestions collection
update version to 2.1.2-SNAPSHOT
fix cut of the last filename character when dropping file on a map
fix location for LinkedFiles

 - LinkedFiles are to be store with the map where thei are linked
add logging regarding linked files
Merge branch '2.1.2' of github.com:CompendiumNG/CompendiumNG into 2.1.2
file copying rework via NIO

 - new file copying utility method
 - use it for copying files when droping a file on a map and copying it into LinkedFiles
add filecopy test
Merge pull request #137 from maiklos/2.1.2

2.1.2
fix encoding of filename when copied into LinkedFiles (#43)
Merge pull request #138 from maiklos/2.1.2

fix encoding of filename when copied into LinkedFiles (#43)
further work on the feature suggestions collection - less than 50 to go
fix exception during startup
Merge branch '2.1.2' of github.com:CompendiumNG/CompendiumNG into 2.1.2
Merge pull request #141 from maiklos/2.1.2

2.1.2 - removing explicitly thrown exception on startup which is not handled anyway
remove limitation to move map out of view #128
Merge pull request #142 from maiklos/2.1.2

remove limitation to move map out of view #128