kb core header path

[petervaro]

All sources should use #include "local/path/to/header.h" instead of <...> when compiling libkb. (Others (eg. wrappers) are already using it.. I have no idea why has kb not written this way.. :/)

[petervaro]

Only *.c files should use the "..." notation, *.h files should use the <...>, because these files will become public/installed and available from system path (/usr/local/...)