imporved models notebook and fixed map overlay bug
Merge branch 'master' of https://github.com/vtsuperdarn/davitpy
added HWM07 to models
moved all fortran open() statement to the DAVITPY environment var
added default pylab import to the davitpy shell
updatetd mac install script
Merge branch 'ajsci'

Conflicts:
	pydarn/radar/radars.hdf5