utils: Move library() calls to beginning of file

It seems that calling library() within a function may fail silently.
Moving them out of the function at the beginning of utils.R fixes this.
One particular place, where all necessary libraries are loaded, seem to
be a much easier way than inside a function.

utils.R

@@ -3,6 +3,10 @@
 # License: GPL version 3
 # Jens Mathis Sauer (c) 2020
 
+library(survival)
+library(survminer)
+library(tidyverse)
+
 #
 # Write plot to filename
 #
@@ -95,12 +99,6 @@ sma_break.time.by = 5 * 365.25
 sma_init <- function() {
 	if (exists("sma_initialized") == FALSE) {
 		print("Initialize secMalASCT workspace")
-
-		print("Loading libraries")
-		library(survival)
-		library(survminer)
-		library(tidyverse)
-
 		print("Loading data")
 		#
 		# Use superassignment operator '<<-' to make