Add extra braces to S_IS*() macros

Original patch by Berker Peksag.

Original patch by Berker Peksag.

This provides a way to specify arbitrary doctest options when using
the CLI interface to process test files, just as one can when calling
testmod or testfile programmatically.

OverflowError when an argument of %c format is out of range.

OverflowError when an argument of %c format is out of range.

for symlinks.

for symlinks.

ssl.SSLSocket.write() and in ssl.SSLContext.load_cert_chain() for strings and
passwords longer than 2 gigabytes.

and in ssl.SSLContext.load_cert_chain() for strings and passwords longer
than 2 gigabytes.

float.__format__() and complex.__format__().

complex.__format__().

'Find in files' by replacing 'open with implicit close' by 'with open' in
GrepDialog method grep_it. Streamline code with enumerate(), direct file
iteration, and output tweak. Add test for this method, including output format.

Problem noted & original patch by Serhiy Storchaka; I tweaked the patch a bit.

http://www.freebsd.org/doc/en/books/arch-handbook/driverbasics-block.html

http://www.freebsd.org/doc/en/books/arch-handbook/driverbasics-block.html

Don't create a temporary buffer of zeroy byte nor call r_string() if the length
is zero, create directly the empty string.