Fix memory accounting in Darwin.

htop currently expects m_size and m_resident in pages (Process.c).
According to the proc_info.h header, the values returned by libproc
are in bytes:
http://www.opensource.apple.com/source/xnu/xnu-1456.1.26/bsd/sys/proc_info.h
Eventually we should change the htop crossplatform API to expect memory
in bytes, but this is the smaller change that should fix it.
Closes #385.

darwin/DarwinProcess.c

@@ -327,8 +327,8 @@ void DarwinProcess_setFromLibprocPidinfo(DarwinProcess *proc, DarwinProcessList
 
       proc->super.time = (pti.pti_total_system + pti.pti_total_user) / 10000000;
       proc->super.nlwp = pti.pti_threadnum;
-      proc->super.m_size = pti.pti_virtual_size / 1024;
-      proc->super.m_resident = pti.pti_resident_size / 1024;
+      proc->super.m_size = pti.pti_virtual_size / 1024 / PAGE_SIZE_KB;
+      proc->super.m_resident = pti.pti_resident_size / 1024 / PAGE_SIZE_KB;
       proc->super.majflt = pti.pti_faults;
       proc->super.percent_mem = (double)pti.pti_resident_size * 100.0
               / (double)dpl->host_info.max_mem;