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 yslt.yml2

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tstylesheet {

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    template "/xsl:stylesheet" {

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        > include yslt.yml2\n\ntstylesheet {\n

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        apply "xsl:template";

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        > }\n

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    }

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    template "xsl:template" choose {

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        when "@match" {

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            | template "«@match»" {

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            |

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            | }

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        }

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        when "@name" {

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            | template "«@name»" {

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            |

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            | }

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        }

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        if "position()!=last()" |

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    }

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}