This routine should be called in programs using SPRANNLIB before any other
function in the library is called. It calls several initialization functions.
If stdout points to a terminal (checked by calling the isatty function), the
ttymode variable is set to 1 (see UTILITY-variables) and the buffering
of stdout is disabled by calling the setbuf function. If not, the program
is probably started in batch mode, and the automatic priority decreasing is
installed -- if LOAD_WARNING is defined, the warning_system_load function
is called, if AUTO_PRIORITY is defined and the INIT_NOPRI flag is not specified
in options, the set_auto_priority function is called.
If SUN4 is defined and the INIT_NOFPE flag is not specified in options,
SPRANNLIB's internal floating point exception handler is installed using the
ieee_flags and ieee_handler functions.
Various other initializations are performed: random_seed is called
with parameter 0; system_time is called with parameter TRUE;
init_full_fname is called; if USERLOGFILE is defined
(see LIBRARY-flags), the fprintf_userlog function is called.
If the INIT_EXIT flag is set in options, the ExitOn variable is
set to TRUE and if the INIT_CORE flag is set, the CoreOn variable is set
to TRUE (see UTILITY-variables).
If the environment variable SPR_NOCHK is set, all network checking
(see check_all_network) will be disabled by setting the variable
NoChk (see UTILITY-variables) to TRUE.
Finally, if the INIT_SILENT flag is not set in options, the routine will
print a version/copyright message.
