Merge branch 'master' of https://github.com/unkn0w7n/calibre

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macOS: Put the application icons in a frame

DRYer

string changes

Always debug print the dbversion

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Also use lock when initializing db manager

Add a lock to allow plugins to sync access to the Kobo db

Kobo driver: Handle WAL journal when copying db

Cleanup previous PR

Bump preview release version

Fix #2101135 [[Enhancement] Toolbar boxes of Look & feel have unneces…

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Actually get kobo db IOError workaround working

Fix #2101434 [KeyError: 11895 : when trying to open AUTHORS](https://…

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Merge branch 'master' of https://github.com/cbhaley/calibre

Move copy_db into a standalone function

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Kobo driver: Use sqlite savepoints for greater robustness

Add an icon for KFX and KFX-ZIP files

Merge branch 'clean-unused-variable' of https://github.com/un-pogaz/c…

Merge branch 'master' of https://github.com/unkn0w7n/calibre

Fix error when using USBDevice without a serial attribute

Bump version for preview release

Ensure connect to folder in USBMS ends with a trailing separator

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Connect to folder: Allow connecting to the specified folder as a spec…