Updated readme
Fixed serialisation of predicate combinations
Added quotes for qualifier content, so it can contain spaces (for keyword contents) and is consistent with GitHub syntax (for date ranges); added associated tests
Added quotes as a prefix operator, enabling string literals containing spaces; added associated tests
Moved expression classes into new package
Predicate -> Qualifier, for consistency with GitHub's parlance
Implemented filter method for FilterExpressions and copy constructor for Qualifier
Implemented find method
Modified FilterExpression::isSatisfiedBy interface, introducing meta-qualifier information and removing the model
Integrated information from in meta-qualifier
Added body predicate and did minor refactoring
Added involves predicate
Removed parentheses from serialised form of AND; added comments with explanation
Browser and main window no longer resize when changing project or adding/removing columns
V0.7.19