share: fix unshare calling wrong repo.__init__() method When running the unshare command, if there's other code that tries to use the repo after the command is finished, it'll end up with a ui object for repo.unfiltered(). This change fixes an erroneous call to repo.__init__() that could be on the repoview proxy class--now it's always done on the unfiltered repo.

statichttprepo.httprangeheader: implement readlines bookmarks.readcurrent() requires readlines() on file objects returned from repo.vfs. It isn't used right now but will be in upcoming patches.

statichttprepo: pass in True to splitlines, not 1 splitlines actually takes a boolean.

mq: don't add '* * *' separators when there is no commit message

bisect: avoid confusing use of variables with same names in nested local scopes

discovery: make note messages for new heads more readable

discovery: tweak error message for multiple branch heads

test-obsolete-checkheads.t: remove todo comment that was fixed in be0fcbb1c92f

convert: readability and test of rpairs function

tests: make doctest test runner less verbose