Lychee 2.6.2

• New Select all albums/photos with cmd+a or ctrl+a
• New Detect duplicates and only save one file (#48)
• New Duplicate photos (#186)
• New Added contributing guide
• New Database table prefix for multiple Lychee installations (#196)
• Improved Use IPTC Title when Headline not available (#216)
• Improved Diagnostics are showing system information
• Improved Harden against SQL injection attacks (#38)
• Fixed a problem with htmlentities and older PHP versions (#212)