not only source SUPPORTED file in glibc sources tree.

Remove just added the sr_rs.utf8@latn alias because it is
derived from sr_rs@latin.

derived from sr_rs@latin.

The makelocalealias.py script no longer ignores UTF-8 mapping.

The makelocalealias.py script now can parse the SUPPORTED file
from glibc sources and supports command line options for source paths.

Original patch by Georg Brandl.

All Python-specific styling is now in the theme anyway.

write_bytes to pathlib.Path objects.

Thanks to Christopher Welborn and Ram Rachum for original patches.

We don't want to go into a full explanation of scopes at this point in the
tutorial, so we just mention that the loop creates or overwrites a persistent
variable while the listcomp doesn't.  Not mentioning this would lead someone
to incorrectly assume loops and listcomps were *completely* equivalent, which
would confuse them later.

Original patch by Rose Ames, tweaked to remove the word 'scope'.

Patch by Francis MB.

Check if the sporadic failure is related to a timeout.
The test just failed on the buildbot "x86 Windows7 3.x": 1 thread done / 20
(the 'done' condition was not signaled because 1 < 20).