Tiny-Doc:
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get_slinearg()		 - returns an argv[] part of the NNTP command sent by the client
ToSend()		 - add buffer to send buffer
charstack_*()		 - push, free and check_for(x) on a stack of char strings
str_concat()		 - concatenate at least 2 and max. 5 strings.
get_openfilelen()	 - the the len of an open file
DB_chk_if_msgid_exists() - check if a given msg id exists for a given newsgroup
filebackend_retrbody()	 - get msg body from file backend
filebackend_savebody()	 - save a msg body in the file backend

