Calibre v2.73 发布了。
更新内容：
新特性：
Add a preference in Preferences->Look & Feel to hide the row numbers in the main book list.
Allow Export/Import of column coloring and icon rules.
Edit Book: Allow bulk changing of file extension for selected files by right clicking ont he selected files in the file browser.
Edit Book: Check Book: Add a check for nav documents that contain no ToC in EPUB 3 books
Edit Book: Check Book: Add a test to check if the embedded fonts in the book have their embedding permissions enabled
Bug 修复：
Pressing the up arrow in an date edit with undefined value should jump to the current date rather than Feb 101
EPUB Input: When an invalid nav based ToC is used in an EPUB 3.0 document that also has a fallback NCX ToC, use the fallback ToC.
Fix a regression that broke the icon theme creation tool in the previous release
Fix insert character dialog not reflowing characters on resize. Also only allow the search bar in the dialog to get input focus
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