subrepo: make 'in subrepo' string easier to find by external tools This patch is meant to make it easier for tools that wrap the mercurial output (such as TortoiseHg) to find the "in subrepo MYSUBREPO" string that (since 9e3910db4e78) is appended after subrepo error messages, particularly when the mercurial output is translated to a non-English language. The message remains the same but the '%s' that was used to prepend the original error message in front of the 'in subrepo' string has been moved out of the translatable string. As an example of the usefulness of making it easy to look for "in subrepo MYSUBREPO" strings, TortoiseHg looks for these strings in error messages in order to "linkify them" (i.e. convert "MYSUBREPO" into alink to the corresponding subrepo). The original string made it hard for a tool such as TortoiseHg to look for the translated string on mercurial's output because the translated string contained the error message itself. This meant that a regular expression was required to ignore the error message part. With this change TortoiseHg can just get the translated "(in subrepo %s)" string, substitute %s for the subrepo path (which it gets from the subrepo exception) and simply search for the resulting string (no regular expression needed, or at least a much simpler regular expression could be used). Additionaly, the existing string could lead a translator mistakenly assume that it was possible invert the order of the %s (error and subrepo path) fields, which would not work because the string interpolation was position based.

subrepo: fix python2.4 compatibility after 9aa6bee6e9f9 super(SubrepoAbort, self).__init__(*args, **kw) raises TypeError: super() argument 1 must be type, not classobj

test-keyword: improve grammar and spelling in branchcache note See: da9e544c69d6

Merge with stable.

repoview: extract hideable revision computation in a dedicated function This will help extensions to plug into the hidden mechanism.

largefiles: make update with backup files in .hglf slightly less broken Largefiles update would try to copy f to f.orig if there was a .hglf/f.orig . That is in many many ways very very wrong, but it also caused an abort if f didn't exist. Now it only tries to copy f if it exists.