Mercurial 2.3.1是个bug修复版本，修正了以下问题。同时TortoiseHg也更新到了2.5版本。
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clone: don't fail with --update for non-local clones (issue3578)
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commit: normalize filenames when checking explicit files (issue3576)
- fileset: actually implement 'minusset'
- fileset: do not traceback on invalid grep pattern
- fileset: exclude deleted files from matchctx.existing()
- fileset: fix generator vs list bug in fast path
- fileset: matchctx.existing() must consider ignored files
- fileset: matchctx.existing() must consider unknown files
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largefiles: adjust localstore to handle batch statlfile requests (issue3583)
- merge: handle case when heads are all bookmarks
- obsolete: import modules within mercurial/ without "from mercurial"
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revlog: don't try to partialmatch strings with length > 40
- rollback: write dirstate branch with correct encoding
- store: only one kind of OSError means "nonexistent entry"
- store: sort the results of fncachestore.datafiles()
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strip: fix revset usage (issue3604)
- templater: handle a missing value correctly
- verify: do not choke on valid changelog without manifest
- wix: bump MSI based installers to use Python 2.7
里面的内容即软件介绍直接引入一点到这个页面，否则一点也看不出这个软件是干啥的。。