Version 1.10

- CHG: Add isOpposite flag to SearchRepeat#Execute() and remove the swapping of a:mappingNext and a:mappingPrev in the opposite mapping definition.
- ENH: Add g:SearchRepeat_IsAlwaysForwardWith_n configuration to consistently always move forward / backward with n / N, regardless of whether the current search mode goes into the opposite direction.
- FIX: SearchRepeat#Execute() needs to return status of SearchRepeat#Repeat() to have clients :echoerr any error.