Fix compiler warning
Merge branch 'master' of github.com:timvdm/Helium
* Add hex_to_bitvec() and bitvec_to_hex() functions to handle *.fps files.
* Update bitvec.h documentation.
Fix include path
Add contract.h to handle pre/post conditions.
Add bitvec test
Compile bitvec test
Some doc updates
Improve threaded brute force similarity search + update documentation
for fingerprints/similarity.h
Fix compiler warning
Remove obsolete code
Include correct header to decrease compile time
Add FpsFile, a class for reading FPS fingerprint files.
Add fps2hel tool to convert FPS fingerprint files to Helium files
Some code to easily run tasks in parallel
Update CMakeLists.txt files
Improve similarity tool's threading support