Fixed bugs related to Bifrost_units class and other minor issues/impr…

…ovements (#19)

* new version of Bifrost_units and minor bugs fixed

* write tools, now it allows to read the new format for saved files in folders and separated momentum and density vars. It also handles old format version

* added root_name need it for Ebysus

* fdir now is separated, just in case ebysus is launched from a different path

* new format

* fixed .value missing and redefined weighted averaged cyclotron frequency

* improved bifrost_units class

* minor improvements on finding first match

* [FIX] To better deal with 0th snap

* [FIX] bad call to interpolate from scipy

* [FIX] reads idl files without number

* [FIX] slight alteration of root file name search for case of snap shot 0

* [FIX] Force crash on write_mesh if x,y, or z axis is not well defined

* removed some unnecessary  prints

* added some warnings and a quicklook printout

* [FIX] find_first_match should not change the path

* improved printi

* now we can select mm_cnu

* [fix] bug for reading electrons

* [FIX] now one can ready different time series ranges

* Cleanup in bifrost.py

* Bugfix bifrost.py

* Removed ebysus from sim/__init__.py due to non-standard packages

* Another removal of ebysus from default loading all in helita.sim

* Removed unused units code in bifrost.py

helita/sim/__init__.py

@@ -5,10 +5,9 @@
 """
 
 __all__ = ["bifrost", "multi", "multi3d", "muram", "rh", "rh15d", "simtools",
-           "synobs", "ebysus"]
+           "synobs"]
 
 from . import bifrost
 from . import multi
 from . import muram
 from . import rh
-from . import ebysus