Calibre 2.49 发布，此版本更新内容如下： 新特性 E-book viewer: Add an option to allow only a single book to be viewed at a time. Trying to view a second book will cause it to replace the currently viewed book. Closes tickets: 1526504 Kobo driver: Add support for the new firmware 3.19.5761 Linux build: Update bundled version of Qt to 5.5.1 Bug 修复 Fix splash screen getting stuck on OSX when restarting calibre in debug mode Get Books: Update plugins for various Polish language book stores to handle changes to the website Amazon metadata download: Handle a change in the amazon website that prevented review metadata from being downloaded Better algorithm for guessing the 'external' network interface that is displayed to the user Tag Mapper: Do not allow the user to create rules with invalid regular expressions E-book viewer: Disallow hyphenation in documents that use mathematical typesetting as the hyphenation breaks that typesetting E-book viewer: Fix some non-ASCII characters not display in embedded MathML. Closes tickets: 1532323 Download calibre plugins securely using HTTPS MOBI Output: Try to autofix corrupted PNG images in the input document. Closes tickets: 1531738 Nook Glowlight Plus: Send files by default to the NOOK/My Files folder. Closes tickets: 1531394 E-book viewer: Fix failure to view comic files that contain non-ASCII characters int heir internal filenames. Closes tickets: 1530517 新增新闻源 LaRed21 by Carlos Alves 改进新闻源 Echo Online Various Uruguayan news sources Economic and Political Weekly Tagesanzeiger 下载：http://calibre-ebook.com/download Calibre是电子书管理软件，支持Amazon、Apple、Bookeen、Ectaco、Endless Ideas、Google/HTC、Hanlin Song设备及格式，功能十分强大。 Calibre 2.49 发布，电子书管理软件下载地址
