[PATCH] Commit and log commands: strings encodings

[Alexander Belchenko]

Here patch that provide extended support for string encodings used in 
commit and log commands. This patch fix 2 bugs.

1) Bug in log commands: bzr use bzrlib.user_encoding instead of 
sys.stdout.encoding for encoding messages. As result on russian windows 
machine (user_encoding == cp1251, but console encoding and 
sys.stdout.encoding == cp866) russian words showed as hieroglyphs.

2) Bug in commit command: bzr not decode message from external editor to 
unicode. As result this message stored "as is" with ampersand coding.

This patch provide 2 new global options:
--input-encoding or -i
--output-encoding or -o

Input encoding used for decoding commit message from external editor AND 
from file. Note: commit message from command line (-m option) always 
decoded to unicode with bzrlib.user_encoding.

Output encoding used for encoding log message.

Ability of customization string encodings is important for inter-program 
communications.

Please review my work. This patch lacks of test cases, I know. But test 
cases for this is very non-trivial, any hints is very appreciated.

Alexander
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