[ffwizard] freifunk-berlin/firmware#94 configure qos scripts correctly

added options to choose bandwidth to shareInternet page, update
/etc/config/qos and /etc/config/olsrd
[ffwizard] freifunk-berlin/firmware#94 configure qos scripts correctly

added fields to configure custom bandwidth fields
[ffwizard] freifunk-berlin/firmware#94 configure qos scripts correctly

added help text, updated labels
[ffwizard] freifunk-berlin/firmware#94 configure qos scripts correctly

updated bandwidths
ffwizard-berlin: fix rerun issue for qos-script

It seems not to be possible to have several fields depend on one flag in luci.
Workaround is to remove cfg entries otherwise validation will fail for not
submitted fields.
ffwizard-berlin: reduce selectable bandwidth

see github.com/freifunk-berlin/firmware/issues/94#issuecomment-59506723
Merge pull request #29 from freifunk-berlin/feature/configureqos

ffwizard-berlin: add support for qos-script