Added a lot of new functions to replace dirty macros. Every macro

* configure.in:
	* glibtop.h:
	* include/glibtop/close.h:
	* include/glibtop/cpu.h:
	* include/glibtop/fsusage.h:
	* include/glibtop/loadavg.h:
	* include/glibtop/mem.h:
	* include/glibtop/mountlist.h:
	* include/glibtop/msg_limits.h:
	* include/glibtop/netlist.h:
	* include/glibtop/netload.h:
	* include/glibtop/ppp.h:
	* include/glibtop/procargs.h:
	* include/glibtop/prockernel.h:
	* include/glibtop/proclist.h:
	* include/glibtop/procmap.h:
	* include/glibtop/procmem.h:
	* include/glibtop/procopenfiles.h:
	* include/glibtop/procsegment.h:
	* include/glibtop/procsignal.h:
	* include/glibtop/procstate.h:
	* include/glibtop/proctime.h:
	* include/glibtop/procuid.h:
	* include/glibtop/sem_limits.h:
	* include/glibtop/shm_limits.h:
	* include/glibtop/swap.h:
	* include/glibtop/sysdeps.h:
	* include/glibtop/sysinfo.h:
	* include/glibtop/uptime.h:
	* sysdeps/common/Makefile.am:
	* sysdeps/common/default.c: (glibtop_close), (glibtop_init),
	(glibtop_get_cpu), (glibtop_get_fsusage), (glibtop_get_uptime),
	(glibtop_get_sysinfo), (glibtop_get_swap), (glibtop_get_proc_uid),
	(glibtop_get_proc_time), (glibtop_get_proc_state),
	(glibtop_get_proc_signal), (glibtop_get_proc_segment),
	(glibtop_get_proc_open_files), (glibtop_get_proc_mem),
	(glibtop_get_proc_map), (glibtop_get_proc_args),
	(glibtop_get_proc_argv), (glibtop_get_proclist),
	(glibtop_get_proc_kernel), (glibtop_get_ppp),
	(glibtop_get_netlist), (glibtop_get_netload),
	(glibtop_get_mountlist), (glibtop_get_mem), (glibtop_get_loadavg),
	(glibtop_get_msg_limits), (glibtop_get_sem_limits),
	(glibtop_get_shm_limits), (glibtop_get_sysdeps):

	Added a lot of new functions to replace dirty macros.
	Every macro glibtop_get_*(buf[, args]) has been turned to a function.

include/glibtop/fsusage.h

@@ -53,7 +53,7 @@ struct _glibtop_fsusage
 	guint64 read, write;    /* Total blocks read and written */
 };
 
-#define glibtop_get_fsusage(fsusage,disk)	glibtop_get_fsusage_l(glibtop_global_server, fsusage, disk)
+void glibtop_get_fsusage(glibtop_fsusage *buf, const char *mount_dir);
 
 #define glibtop_get_fsusage_r		glibtop_get_fsusage_s