Merge pull request #398 from olivierbeytrison/fix-pair-compare

compare only attributes of the same type
Only return errors once from fr_strerror
Cleanup code

Bring radsniff into line with collectd naming requirements
Collectd type definitions
Allow rad_packet_ok to return a detailed failure code
Check something has initialised the log buffer
Print out system error message if we fail creating sqlite db
Typo
Print out proper error string on database init if sqlite3_errstr is available
Use DICT_ATTR in rlm_counter
code refactoring
Implement pairfind_da