matplotlib Code

cutils.py: fix and clarify absolute imports, so I don't get confused next time

[2895114] _get_data_path: improve py2exe handling and readability.
Also convert some imports to absolute.

cbook: handle empty string returned by locale.getpreferredencoding
Reported by Huziy Oleksandr.

[3015614] give examples/api/font_file.py a fighting chance on Linux and Win

numpy version check: make it more readable

[1474254] getp, setp: minor clarifications

[1467533] pie shadows are tagged with _nolabel_

[2922266] pyplot_tutorial.rst: remove tabs from code (patch by Ori Avtalion)

[2922387] axis.py: docstring fix by Ori Avtalion

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