[flxcard] THROW_FLX_EXCEPTION(): improve some messages; errorString():...
[flxcard] THROW_FLX_EXCEPTION(): improve some messages; errorString(): reimplemented; flx-info: add PODPOWERRX
[flxcard] THROW_FLX_EXCEPTION(): improve some messages; errorString(): reimplemented; flx-info: add PODPOWERRX