Merge pull request #6 from brorfred/master

 - Fixed problems with reading necdf files in getfile 
 - Moved around a bunch or statements and modules.
 - Moved out most statements from loop to different modules.
 - Cleaned up streamfunction modules to one.
 - Started to move datasetswap to mod_vel.
 - Changed wflux to be calcualted once every change over velocity field when full_wfluxx is selected.
Fixed some typos in README
Merge pull request #11 from joakimkjellsson/master

Some small changes
test2
Merge pull request #13 from doos/master

Changed comment position- Pull request from Doos.
Merge tracmass to brorfred