Simplify outputs of 'pyxel.run_mode' in Exposure mode
Currently, when using function pyxel.run_mode
with Exposure mode, the main data buckets ('photon', 'signal'...) are stored into a subtree into the results.
It would be better to store these data buckets directly in the root subtree.
Before:
>>> import pyxel
>>> data_tree = pyxel.run_mode(...)
Get Photon
>>> data_tree['/bucket/photon']
Get Data
>>> data_tree['/data']
After:
>>> import pyxel
>>> data_tree = pyxel.run_mode(...) # Nothing changed
Get Photon
>>> data_tree['photon'] # THIS IS SIMPLER
Get Data
>>> data_tree['/data'] # UNCHANGED