value flow: Use ValueFlow in CheckBufferOverrun
Tokenizer: Removed simplifyComparisonOrder
Tokenizer: Removed simplifyGoto as it's the cause of various FPs I see
CheckOther: Removed non-valueflow check for division by possible zero before condition
Tokenizer: Removed commented-out simplification
CheckNullPointer: Removed some of the old checking that doesn't use ValueFlow
Removed the --value-flow flag. ValueFlow analysis will always be enabled from now on.
Fixed Cppcheck warning. db is dereferenced before its checked against NULL
Refactoring: Moved astStringify to the Token class and renamed it to expressionString. This can often be useful when reporting error messages that contains source code.
BufferOverrun: Improved error message when array index is used before checking that its in limits
valueflow: better handling of increment/decrement
BufferOverflow: Updated message for out of bounds array index or redundant condition