Cross database testing evaluation

Adds a new command bob pad cross to evaluate PAD systems in cross database settings

added 2 commits

• ca19f332 - convert features to float64 before using them in SVM
• 12ed10cd - use new click features

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added 14 commits

• 12ed10cd...172d46e0 - 6 commits from branch master
• 4d9278b7 - Add a script for cross db analysis
• ed8f110a - Fix the renamed option
• 37726f48 - More detailed and sorted table
• 3e83cf9a - Handle nans in sorting more properly
• ef993dd2 - convert features to float64 before using them in SVM
• 9a65c660 - use new click features
• 88d40c99 - remove protocol names as well
• cb6d74b9 - Use the builtin method for converting frame containers to arrays

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added 2 commits

• a029591f - Add support for renaming algs in bob pad cross
• 7a8a04ba - Add a command to finalize scores

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merged

mentioned in commit 5d9460a9