MAExternalFileModel should override the equals method

> Hello,
>
> I had a problem with updates of css files in Pier (using the
> pharo-1.0-10491-rc1web09.10.5 image). My updates were ignored.
>
> After some debugging I found out that the the cause of the problem was that
> two different MAExternalFileModel instances compared equal. They were both
> called 'style.css' but they had a different location. The location was not
> checked in the equals method. After adding the following equals method to
> MAExternalFileMethod everything worked fine:
>
> = anObject
>     ^super = anObject and: [ self location = anObject location ]
>
> Greetings,
> Jan.
>
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