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

record: use "ui.extractchoices()" to get the list of available responses Before this patch, record extension gets the list of available responses from online help document of "hg record" in the tricky way, even though the value passed to "ui.promptchoice()" has enough (maybe i18n-ed) information. This patch uses "ui.extractchoices()" to get the list of available responses.