V0.6.18 Suleika

New features:

• Enabled search for text based custom column content in simple search

Bug Fixes:

• Bugfix errors for load metadata from amazon are now properly handled
• Errors with readonly library are handled better
• Bigfix author sort order differs from authors order with readonly database
• Improved cover extraction for epub files, better epub cover parsing with multiple cover-image items
• Undo check of read checkbox in case of error
• Display error message in details modal dialog instead of putting it to the hidden UI
• Bugfix set archive bit in booktable
• Added environment variables for reconnect
• Catch additional error on not existing custom column linked to read column
• Prevent metadata changes are lost on edit books with errors
• Bugfix remember sort order of series and authors if entered from link below book cover
• Bugfix gmail.json location
• Series Link in series view no longer clickable
• import error on python <3.7 dataclasses solved
• Deactivated several functions for kindle, tolino, bookeen and kobo e reader. Opening books now working for ebook readers
• Bugfix show covers from goodreads
• Bugfix for advanced search with linked read column and read column having a higher number than number of available custom columns
• Bugfix for plus ("+" vs. "%2B") encoded search strings in opds search feeds are now working
• Bugfix logging with gdrive
• Bugfix database locked in combination with gevent

Security fix: Prevent possible SQL Injection in user table Thanks to Iman Sharafaldin (Forward Security)
Security fix: SSRF protection no longer can be bypassed by IPV6/IPV4 embedding. Thanks to @416e6e61
Security fix: SSRF protection no longer can be bypassed to connect to other servers in the local network. Thanks to @michaellrowley