[ 1052399 ] plistlib: add plst resource functionality, fix bugs

the indentation of a comment block to be ignored when reformatting the
block, leading to overly long reformatted lines (too wide by an amount
equal to the indentation width).  Looks like a typo in the original
patch, a 1-character repair.

Applies patch #1051866.  Thanks Felix Wiemann.

know that the newly-started Python process only has 3 filedescriptors
open. Fixes bug 1048808.

os.path.dirname() or os.path.basename() instead

(Contributed by Bob Ippolito.)

backport candidate.

(Contributed by Oleg Broytmann.)

(Contributed by Neal Norwitz.  Reviewed by Facundo Bastista.)

Remove the current version of zlib (we'll just have to keep updating it); rewrite following sentence to make sense without the previous one

LaTeX-as-used-in-Python-documentation, and added some notes about
what's missing

and day of the week are specified.

Closes bug #1045381.