The fix for issue 4050 caused a regression:  before that fix, source
lines in the linecache would eventually be found by inspect.  After the
fix inspect reports an error earlier, and the source isn't found.
The fix for the fix is to have getsourcefile look in the linecache for
the file and return the psuedo-filename if the source is there, just as
it already returns it if there is a PEP 302 loader.

documentation.  Thanks Mads Kiilerich.

the (approximate) range (-27.3, 30.0), as a result of an escaped errno
value.

clarifications and documentation tweaks.

Backport of revisions 81955-81956 from py3k.

the interpreter with characters outside the Basic Multilingual Plane
(higher than 0x10000).

Backport of revisions 81897, 81898 and 81902 from py3k.

Issue 8948. cleanup functions are not run by unittest.TestCase.debug(), plus class and module teardowns are not run by unittest.TestSuite.debug().

done in r81843 for py3k.