Fix expension of macros in pointers with default values.

For example :

in xsl decl widget_class(%name, *clsname="%nameWidget", match="widget[@type='%name']", mode="widget_class") alias template {
| class `text **clsname` extends Widget{
content;
| }
};

widget_class('Input');

gives now :

<xsl:template match="widget[@type='Input']" mode="widget_class">
<xsl:text>class </xsl:text>
<xsl:text>InputWidget</xsl:text>
<xsl:text> extends Widget{
</xsl:text>
<xsl:text>}
</xsl:text>
</xsl:template>

Without the fix, <xsl:text>InputWidget</xsl:text> would be <xsl:text>%nameWidget</xsl:text>

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include uml.yml2

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UML {

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    include uml2sql.yml2

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    Root applyPackages;

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    Package {

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        param "name", "''";

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        if "$name=''"  apply "packagedElement", 0 { with "name", "@name"; }

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        if "$name!=''" apply "packagedElement", 0 { with "name", "concat($name, '_', @name)"; }

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    }

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    Class {

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        param "name";

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        | CREATE TABLE «$name»_«@name» (

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        applyAttributes;

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        | );

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    }

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    Attribute | «@name» †type`if "position()!=last()" > ,`

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}