no need for too READMEs, right?
added test case to verify #47
removed 'Classes path set more than once' warnings
replcase -Os by -O2 for boost mode to prevent optimization releated 'strange' issues
tentative fix for #49
forgot this loadpath in earlier commit...
added png version of logo, I guess this will be useful for others, too
prevent Void call in class invariant in case of not existing directory
fixed typo
closes #50