Heine

#480044 by JohnAlbin: fix system component listing lookup priorities, so the sites/all/* items will override the profile shipped items as documented

#107824 by Frando, heyrocker, Dave Reid, AlexisWilke, andypost: the dblog referer and the statistics url columns were not in line with how we store URLs elsewhere (like the dblog location column); could result in data loss due to length truncation

- Patch #576530 by David_Rothstein: toolbar should say 'Log out' rather than 'Logout'.

- Patch #572942 by cwgordon7: proper comment wrapping.

- Patch #570572 by winston, David_Rothstein | Shai, Xano, alexanderpas, emmajane, kazar: changed label for user/1 account from 'administrator' to 'site maintenance account'.

- Patch #575360 by dropcube: added API function to check if a cache bin is empty.