* pyatmlab-0-0-52

* pyatmlab/collocations.py(CollocationDescriber):

- Continued work on partial columns.  Remains unfinished.

- Split smoothing method in smaller methods

* pyatmlab/dataset.py:

(Dataset): Move 'range' attribute to ProfileDataset

(ProfileDataset): Move 'range' attribute here.

* pyatmlab/datasets.py:

- Based on partial column sensitivity studies, write an estimated
range for TANSO and ACE

* pyatmlab/math.py:

(layer2level):

- Improve vectorisability

(regrid_ak):

- Make sure we take care of flagged/invalid data

* pyatmlab/physics.py(AKStats):

- When doing sensitivity studies, write some diagnostics