Remove units from numbers

This is a first step to decouple formatting from information because of
two reasons:

 1. The components should only gather and return the values by design
 2. Fine grained user control should be a focus

Scaling will be implemented in a different way in a later commit.

util.h

@@ -10,6 +10,6 @@ void die(const char *, ...);
 
 int esnprintf(char *str, size_t size, const char *fmt, ...);
 const char *bprintf(const char *fmt, ...);
-const char *fmt_human_2(size_t num, char *unit);
-const char *fmt_human_10(size_t num, char *unit);
+const char *fmt_human_2(size_t num);
+const char *fmt_human_10(size_t num);
 int pscanf(const char *path, const char *fmt, ...);