bindings: enable tests depending on library loading during runtime

this should work since 4a43b96023f9a74b0362fadb82d97c1624b15052
Merge pull request #152 from manuelm/disabled_tests

bindings: enable tests depending on library loading during runtime
properly search for discount
todo for next release
example as discussed with Manuel
advertise list-tools
add plugin counter
reenable python3 (fixed with swig3?)
comment from meeting
fix text of qt-gui exclusion
little improvements in RELEASE todo
search for swig3 too

+ correctly remove bindings if no swig found
add first kdb C tests
improve docu + examples
make states even more clear
fix bash: remove RANDOM
guidelines to only write to /tests
fix memleak
move pre cond
kdb examples as compiled source

rename uniformly (kdb*)