Added code to write archive without processing
Added new source file for Autotools and CMake
Copyright cleanup
Remove unused stdlib includes
Removed unused libarchive includes
Removed placeholder function as it can be replaced by NULL
Switched to more portable idiom for marking unused args
Added first, initial test for raw files
Added test for adding two files using raw format

Also, fixed actual code. Hooray for tests.
Added test which tries adding directories (unsupported)
Added another test which uses the base64 filter
Added (minimnal) documentation for raw format
Alphabetic order in build configuration
Proper type for error return
free does not fail anymore

No idea why, maybe because I rebuilt the library
Dummy function is not required anymore
Fix alphabetic order in manpage