Docs for SQLTABLE

    given a Rows object, as returned by a db().select(), generates
    an html table with the rows.

    optional arguments:

    :param linkto: URL (or lambda to generate a URL) to edit individual records
    :param upload: URL to download uploaded files
    :param orderby: Add an orderby link to column headers.
    :param headers: dictionary of headers to headers redefinions
                    headers can also be a string to gerenare the headers from data
                    for now only headers="fieldname:capitalize",
                    headers="labels" and headers=None are supported
    :param truncate: length at which to truncate text in table cells.
        Defaults to 16 characters.
    :param columns: a list or dict contaning the names of the columns to be shown
        Defaults to all

    Optional names attributes for passed to the <table> tag

    The keys of headers and columns must be of the form "tablename.fieldname"

    Simple linkto example::

        rows = db.select(db.sometable.ALL)
        table = SQLTABLE(rows, linkto='someurl')

    This will link rows[id] to .../sometable/value_of_id


    More advanced linkto example::

        def mylink(field, type, ref):
            return URL(args=[field])

        rows = db.select(db.sometable.ALL)
        table = SQLTABLE(rows, linkto=mylink)

    This will link rows[id] to
        current_app/current_controlle/current_function/value_of_id

    New Implements: 24 June 2011:
    -----------------------------

    :param selectid: The id you want to select
    :param renderstyle: Boolean render the style with the table

    :param extracolums = [{'label':A('Extra',_href='#'),
                    'class': '', #class name of the header
                    'width':'', #width in pixels or %
                    'content':lambda row, rc: A('Edit',_href='edit/%s'%row.id),
                    'selected': False #agregate class selected to this column
                    }]


    :param headers = {'table.id':{'label':'Id',
                           'class':'', #class name of the header
                           'width':'', #width in pixels or %
                           'truncate': 16, #truncate the content to...
                           'selected': False #agregate class selected to this column
                           },
               'table.myfield':{'label':'My field',
                                'class':'', #class name of the header
                                'width':'', #width in pixels or %
                                'truncate': 16, #truncate the content to...
                                'selected': False #agregate class selected to this column
                                },
               }

    table = SQLTABLE(rows, headers=headers, extracolums=extracolums)