Account: Incosistent headers in invoice report

[Leonardo Donelli]

The invoice report has different table headers for the first page and all the others page. that's because pto_header (the 'repeting' header) in account_print_invoice.rml is different than the 'normal' header (the one used in the first page).

pto_header:
    <pto_header><!-- Must be after setLang() -->
    <blockTable colWidths="202.0,87.0,71.0,57.0,42.0,71.0" style="Table7">
    <tr>
        <td><para style="terp_tblheader_Details"><b>Description</b></para></td>
        <td><para style="terp_tblheader_Details_Centre"><b>Taxes</b></para></td>
        <td><para style="terp_tblheader_Details_Centre"><b>Quantity</b></para></td>
        <td><para style="terp_tblheader_Details_Right"><b>Unit Price</b></para></td>
        <td><para style="terp_tblheader_Details_Right"><b>Disc.(%)</b></para></td>
        <td><para style="terp_tblheader_Details_Right"><b>Price</b></para></td>
    </tr>
    </blockTable>
    </pto_header>

normal header:
    <blockTable colWidths="185.0,70.0,80.0,60.0,50.0,85.0" style="Table7">
      <tr>
        <td>
          <para style="terp_tblheader_General"><b>Description</b></para>
        </td>
        <td>
          <para style="terp_tblheader_General_Centre"><b>Taxes</b></para>
        </td>
        <td>
          <para style="terp_tblheader_General_Right"><b>Quantity</b></para>
        </td>
        <td>
          <para style="terp_tblheader_General_Right"><b>Unit Price</b></para>
        </td>
        <td>
          <para style="terp_tblheader_General_Right"><b>Disc.(%)</b></para>
        </td>
        <td>
          <para style="terp_tblheader_General_Right"><b>Price</b></para>
        </td>
      </tr>
    </blockTable>

Notice how the colWidths param of the blockTable element
       and the style param of the para element
are different.