This is a combination of 2 commits.

tdf#114173 Preserve size of chart legend during xlsx export

During export chart into .xlsx file,
the information about size of legend was not saved.
Example of proper size:
                    <c:w val="0.41459448854442293"/>
                    <c:h val="0.23161616722845749"/>
another issue was hardcoded "layoutTarget" which
was always "inner":
                    <c:layoutTarget val="inner"/>
also properties regarding default text style was not preserved:

            <c:txPr>
                <a:bodyPr/>
                <a:lstStyle/>
                <a:p>
                    <a:pPr>
                        <a:defRPr sz="900" b="0" i="0" u="none" strike="noStrike" kern="1200" baseline="0">
                            <a:solidFill>
                                <a:schemeClr val="tx1">
                                    <a:lumMod val="65000"/>
                                    <a:lumOff val="35000"/>
                                </a:schemeClr>
                            </a:solidFill>
                        </a:defRPr>
                    </a:pPr>
                    <a:endParaRPr lang="pl-PL"/>
                </a:p>
            </c:txPr>

With this patch all these issues was resolved, and in case
of layoutTarget "outer", the field is not availble at all,
according to specification.

Change-Id: I2c9b7a112bdd911542b5273e660222d7fefa2d88
Reviewed-on: https://gerrit.libreoffice.org/47358Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>
Tested-by: Mike Kaganski <mike.kaganski@collabora.com>
(cherry picked from commit 84392651)

crashtesting: multiple export failures

since...

commit 84392651
Date:   Wed Jan 3 23:27:16 2018 +0100

    tdf#114173 Preserve size of chart legend during xlsx export

Change-Id: Iebc936a0f490d6b707dfee0343732753f56728e7
Reviewed-on: https://gerrit.libreoffice.org/48147Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>
(cherry picked from commit fa68bed1)
Reviewed-on: https://gerrit.libreoffice.org/48153Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Eike Rathke <erack@redhat.com>
Reviewed-on: https://gerrit.libreoffice.org/48726