Removed get_time from common.c

Uses GDateTime instead

src/common.h

@@ -37,7 +37,6 @@
 
 void p_slist_free_full(GSList *items, GDestroyNotify free_func);
 void create_dir(char *name);
-void get_time(char *thetime);
 char * str_replace(const char *string, const char *substr, 
     const char *replacement);
 int str_contains(char str[], int size, char ch);