tests/test-churn.out

color: colorize based on output labels instead of parsing output

By overriding ui.write(), ui.write_err(), ui.popbuffer(), and ui.label(),
the color extension can avoid parsing command output and simply colorize
output based on labels.

As before, the color extension provides a list of default colors for
core commands/labels. Other extensions can provide their own defaults by
specifying a colortable dict (similar to cmdtable).

In this process, --color is promoted to a global option and the deprecated
--no-color option is removed.

% create test repository
adding a
adding b
adding c
% churn separate directories
user1      1 ***************************************************************
% churn all
user3      3 ***************************************************************
user1      3 ***************************************************************
user2      2 ******************************************
% churn up to rev 2
user2      2 ***************************************************************
user1      1 ********************************
% churn with aliases
alias3      3 **************************************************************
alias1      3 **************************************************************
user2       2 *****************************************
% churn with .hgchurn
alias3      3 **************************************************************
alias1      3 **************************************************************
user2       2 *****************************************
% churn with column specifier
user3      3 ***********************
user1      3 ***********************
user2      2 ***************
% churn by hour
06      1 *****************
09      2 *********************************
12      4 ******************************************************************
13      1 *****************
% churn with separated added/removed lines
user1           +3/-1 +++++++++++++++++++++++++++++++++++++++++--------------
user3           +3/-0 +++++++++++++++++++++++++++++++++++++++++
user2           +2/-0 +++++++++++++++++++++++++++
% churn --diffstat with color
user1           +3/-1 +++++++++++++++++++++++++++++++++++++++++--------------
user3           +3/-0 +++++++++++++++++++++++++++++++++++++++++
user2           +2/-0 +++++++++++++++++++++++++++
% changeset number churn
user1      4 ***************************************************************
user3      3 ***********************************************
user2      2 ********************************
adding foo
test      0