Travis: install dependencies for condenser search tests

use travis to install blast
check if blast binaries are running
make travis show last stderr of failing test
travis: check for makeblastdb
fix and improvement for intset

searching for a number > as the largest in the set resulted in an error.
this is not as intended, it should return the number of elements in that
case.
add scripts
cosmetics, comments
improve condenser toolset

* fix memory bugs
* add new filter method for kmer processing in compress
* renamed subtools
* changed tests to include more testing, with smaller datasets
* general bugfixes
let blast use threads (8 default)
make non exposed fkts static
fix error in window resetting
fix window issue
fix issue with position arrays beeing empty or wrong positions