10/16/2016: updated calls to PubMed and PMC to reflect the NCBI's change to the HTTPS protocol.
affects: gnat.server.GnatService
5/26/2015: added a kill signal for memory-resident dictionaries
see gnat.server.dictionary.StopDictionaryServer
requires password that is set at startup of each dictionary
password can be stored in isgn_properties.xml, from which it will be fetched (if no command line parameter given) from both the Start- and StopDictionaryServer classes
sends a simple <stop passphrase=".."> message to the server (separate call for each port)</stop>