run-tests: test each line matching function on its own This has several advantages. * Each match function can return some information to the caller runone (used in the next patch). * It is not checked that the line ends in " (glob)" when rematch() returns false. * And it looks more readable.

tests: new test for line matching functions in run-tests Test for failing matches and warnings. (The existing test-run-tests.t can not do both by design.) And simulate matching on other os.

test-backout: add multiple summary calls to monitor result wc The main goal is to monitor that working directory parent are correct after backout. This will be useful the next changeset introducting magic merge usage.

transplant: use "ui.extractchoices()" to show the list of available responses Before this patch, transplant extension shows the list of available responses by specific string, even though the prompt string passed to "ui.promptchoice()" has enough (maybe i18n-ed) information. This patch uses "ui.extractchoices()" to show the list of available responses.

transplant: use "ui.promptchoice()" for interactive transplant Before this patch, transplant extension uses "ui.prompt()" for interactive transplant, and has to check whether user response returned by "ui.prompt()" is valid or not in own code. In addition to it, transplant extension uses response characters (e.g. "y", "n", and so on) directly in own code, and this disallows to use another response characters by translation, even though the help shown by '?' typing is translatable. This patch uses "ui.promptchoice()" instead of "ui.prompt()" to resolve problems above.

transplant: add test for interactive transplant