ngspice.h, sharedspice.c: sh_putc etc: use int instead of const char
sharedspice.c: sh_puts etc: use int instead of const char
sharedspice.c: some white space and other clean ups
dctran.c, sharedspice.c: function sharedsync has modified parameter list
dctran.c: undo uncorrect XSPICE/CLUSTER preprocessor nesting
remove unused backup file