Big syntax and roxy overhaul. 

Major mods to get_temp methods, that are more accurate for bottom temp extractions. Haven't tested all cases that were covered by current master of rGLM. These include 0 size .nc files, and dried up lakes etc.

@lawinslow I am going to keep this open until my syntax overhaul is complete. Just wanted to give you a heads up as to what the changes look like. 
get.bth, if I understand the change you're making. Just saying you may want a way to pull it into R, not just write to file.