Updated Server-Library routines

The following updates have been made to the Server-Library routines:

  1. Server properties SRV_S_LOGFILE and SRV_S_TRUNCATELOG can now be set after calling srv_init.

  2. After srv_init is called, setting the SRV_S_LOGFILE property with bufp set to an empty string ("") and buflen set to zero will close the log file.