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. 
Instead of doing the get.lvl stuff (for get.bth too), I am just doing write_lvl functions (and similar) that do the gets and just write to file. I can't think of cases where you want these specialized data unless you are going to use remoteLA.