[Lazarus] LazReport Band.name patch

[Giuliano Colla]

While implementing an application which uses LazReport, trying to take 
advantage of OnBeginBand I discovered that Band.Name is never set and is 
left as an empty string.
This can be annoying if you have more than one Band of the same type, so 
that Band.Typ is not enough to tell the right band.
Here attached two patches which for me fixed the issue, one, an svn 
diff, for the svn version 2.4, and the other, a plain diff, for the 
current Lazarus release (1.0.4) version, i.e. 2.3.
Maybe it can be done much better, but just in case...

Giuliano

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