fix debug handling
only include debug functions if needed
fixed includes and some data types for RPL
fixup added missing initializer brackets
fixup changed RPL_ROOT_RANK to 256
fixup changed DEFAULT_OCP to 0 (of0)
network stack related includes
Merge pull request #205 from OlegHahm/rpl_includes

fixed includes and some data types for RPL
Merge pull request #238 from mehlis/debug-guard

Debug: guard some code