+ Add two protected methods. FirstEditable() and LastEditable().
Several change for use this methods.
! Fix in ParsePict method
* @D function, overwrite the mask for SET DATE FORMAT
* @S without lenght parameter or @S0, they don't have effect.
! Fix in Untransform method
* if ::lEdit is false, return ::VarGet() without evaluate
the buffer contained.
* Better detection of a negative, minimizing false detections.
* Improvement in the handling of mask.
* More compliant in @D, @E, @X, @C, @(, @) functions.
* In compliant with Clipper, the lenght of number (internal lenght)
corresponds to the applied picture.
! Bug in conversion with date types and with @E function.
! Fix in Overstrike and Insert method
* First it is evaluated if the input character is valid, before
cleaning the var.
! Fix in Input method
* The minus sign can be writed in any place.
* Now work with '$' and '*' templates in numeric gets.
! Fix in PutMask method
* More compliant in the handling of some get functions.
* When edit a get with @B, the number is editing right-justified.
! Fix in Backspace method
* Permit delete a '(' symbol in a non-editable position, when
this symbol represent a negative number.
! Fix in Delete method
! When delete a negative symbol '(' or '-', turn the ::minus tu false
! Fix in IsBadDate function
! Evaluate crrectly a date with @E function.
6a9ddd0971