properly clone base dataaccess
improved error checking

have to do this to pass current round of implementation. Also fixed
filename in debug output
Added warnings and callbacks, getChannelMessages()

If end of chain then echo out warning and still call callback. Added
getChannelMessages stub. Also fixed filename in debug output.
additional proxy engine implementation

Implemented: getUserPosts, getGlobal, getChannelMessages,
getHashtagEntitites, getInteractions. Updated setChannel & getPost
dispatcher parameters. Added getEntities callback. Also fixed filename
in debug output.
*ToAPI functions, more implementation glue

Created User/Post ToAPI wrapper to convert storage format to internal
format. Implemented: getPost, getGlobal, getUserPosts, getUserStars,
getHashtag, getChannel, getChannelMessages