Added load average detection to datalayer.h, and implemented it in datalayer_Linux.c.
Replaced linux-specific code in LoadAverageMeter.c
Moved various linux specific functions from ProcessList.c to datalayer_Linux.c
Using sysinfo() to get uptime in datalayer_Linux.c
Made several of the datalayer.h functions return void.  They didn't need return values.
No longer freeing caption in Meter_setCaption.  The caption argument was never a heap variable.