used cppcheck, valgrind on the examples.

fix the C interface free(), the example, the build type select.

update the cppcheck files, add the clang scanbuild script

Signed-off-by: Luca Fulchir <luker@fenrirproject.org>

Enable Profiling for both gcc and clang.
This should give us a small boost in performance,
specially on few symbols per block.

Also: mark CMake features as advanced and use a forward
declaration instead of a struct in the C interface.

Signed-off-by: Luca Fulchir <luker@fenrirproject.org>

Also, fix a bit the C example.

Signed-off-by: Luca Fulchir <luker@fenrirproject.org>

lots of bugfixes, also due to the creation of a couple of examples
for the C and C++ interface. Updated documentation accordingly

Signed-off-by: Luca Fulchir <luker@fenrirproject.org>

Signed-off-by: Luca Fulchir <luker@fenrirproject.org>

Also, the C interface should return uint64, not uint32

Signed-off-by: Luca Fulchir <luker@fenrirproject.org>

Worst case: 1-byte alignment, decoding of
881GB of data. We need 40 bits.

Signed-off-by: Luca Fulchir <luker@fenrirproject.org>

Also: CMake flags fix

Signed-off-by: Luca Fulchir <luker@fenrirproject.org>

Signed-off-by: Luca Fulchir <luker@fenrirproject.org>

Let everything be called by our C friends.

Signed-off-by: Luca Fulchir <luker@fenrirproject.org>