calibredb check_library: Do not create empty library if user specifies incorrect path
version 1.31
Make the list of color names tooltip appear when creating an enum column as well as when editing one.
Merge branch 'master' of https://github.com/cbhaley/calibre
Allow specifying arbitrary colors for column coloring rules
Allow specifying arbitrary colors as hex triplets when creating custom columns with a fixed set of values. Fixes #1302078 [Allowing RGB colors for custom columns](https://bugs.launchpad.net/calibre/+bug/1302078)
Dont serialize alpha color component as the QColor constructor cannot handle them
Add Kovid's ColorButton to the advanced coloring rule editor
Merge branch 'master' of https://github.com/cbhaley/calibre
Merge branch 'master' of https://github.com/kovidgoyal/calibre
When replacing multiple recipes, get_custom_recipe_collection is now
only called once.