Added global struct "options"

Substituted opt_* with options.align, options.user, options.syscalls,
                       options.libcalls, options.demangle
diff --git a/process_event.c b/process_event.c
index 7c8a725..f3c966d 100644
--- a/process_event.c
+++ b/process_event.c
@@ -213,7 +213,7 @@
 
 static void
 process_syscall(struct event *event) {
-	if (opt_S) {
+	if (options.syscalls) {
 		output_left(LT_TOF_SYSCALL, event->proc,
 			    sysname(event->proc, event->e_un.sysnum));
 	}
@@ -228,7 +228,7 @@
 
 static void
 process_arch_syscall(struct event *event) {
-	if (opt_S) {
+	if (options.syscalls) {
 		output_left(LT_TOF_SYSCALL, event->proc,
 				arch_sysname(event->proc, event->e_un.sysnum));
 	}
@@ -280,7 +280,7 @@
 		enable_all_breakpoints(event->proc);
 	}
 	callstack_pop(event->proc);
-	if (opt_S) {
+	if (options.syscalls) {
 		output_right(LT_TOF_SYSCALLR, event->proc,
 			     sysname(event->proc, event->e_un.sysnum));
 	}
@@ -293,7 +293,7 @@
 		calc_time_spent(event->proc);
 	}
 	callstack_pop(event->proc);
-	if (opt_S) {
+	if (options.syscalls) {
 		output_right(LT_TOF_SYSCALLR, event->proc,
 				arch_sysname(event->proc, event->e_un.sysnum));
 	}