Collect "common" issues around NGObjWeb ...

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* Endless Recursion in sope -authenticatorInContext:

  sope coredump, endless recursion: -authenticatorInContext:
---snip---
#1038 0x00eda4c4 in -[OFSFolder authenticatorInContext:] (self=0x937b30, _cmd=0x3be4, _ctx=0x9387d0) at OFSFolder.m:747
#1039 0x00ed4074 in -[OFSBaseObject authenticatorInContext:] (self=0x943f30, _cmd=0x3be4, _ctx=0x9387d0) at OFSBaseObject.m:219
---snap---
  - this occures if htpasswd cannot be resolved as the authenticator
    - htpasswd will be returned as a regular file (OFSFile object) which 
      leads to a recursion
    use: -SoOFSDebugAuthLookup YES to detect
    - htpasswd becomes an OFSFile instead of a OFSHttpPasswd because the
      core SoProducts (SoOFS.sxp) are not properly found!
    - mixed up on GNUstep on MacOSX
    use: SoProductRegistryDebugEnabled YES to detect

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