Form-validation revalidate visual clue

Added a small slideDown() animation when validating. This gives a better clue that validation still not ok.
Merge pull request #2145 from GDmac/2.0

check dates in fromPost instead of in setValues
Merge pull request #2146 from GDmac/purdy-validation

Form-validation revalidate visual clue
Switching two checks for sessionkey and token to '==='-strict.
Initialise $val array