roadmap
Revert "remove jni"

This reverts commit 2819b23ecb0d47b97042d0974f9ab8f47372c289.
handle exception properly + fix classpath
also close plugin
make constructor and args locally
get now works, too
now call all methods
passing pointer works
implement more from keyset (incl. iterator)
keyset fully implemented, output more
part of contract is overwritten successfully
rename constructor + do release
allow pluginconfig

+ disable everything in module mode
check and info now take parameters
Merge branch 'master' into java
allow to pass either Key or Pointer in KeySet-Constructor
fail on exception + add warning

- with exception's name
- fix when exception is checked:
 - not when no exception can occurr
 - before if which checks return value
add printing, be more failsafe

fix size calculation for strcat
use correct error number
add two more example plugins