revlog: add docstring for checkinlinesize() The name is deceptive: it does more than just "check." Add a docstring to clarify what's going on.

windows: insert file positioning call between reads and writes fopen() and fdopen() have a unique-to-Windows requirement that transitions between read and write operations in files opened in modes r+, w+, and a+ perform a file positioning call (fsetpos, fseek, or rewind) in between. While the MSDN docs don't say what will happen if this is not done, observations reveal that Python raises an IOError with errno 0. Furthermore, I /think/ this behavior isn't deterministic. But I can reproduce it reliably with subsequent patches applied that open revlogs in a+ mode and perform both reads and writes. This patch introduces a proxy class for file handles opened in r+, w+, and a+ mode on Windows. The class intercepts calls and audits whether a file positioning function has been called between read and write operations. If not, a dummy, no-op seek to the current file position is performed. This appears to be sufficient to "trick" Windows into allowing transitions between read and writes without raising errors.

tests: suppress verbose output of svn transaction Subversion 1.9 shows more verbose messages than 1.8 and the tests fail because of them. These outputs are not important in our tests, so let's suppress them by -q or grep -v.

formatter: use dict.update() to set arguments passed to write functions This isn't important, but update() is better than loop in general.

formatter: verify number of arguments passed to write functions zip() takes the shortest length, which can be a source of bug.

help: unify handling of DEPRECATED/EXPERIMENTAL keywords This fixes listexts() to exclude translated "(DEPRECATED)" marker correctly. On the other hand, help_() doesn't need translated keywords, but I don't think it's worth to separate untranslated keywords just for it.