ls and export-branch fails with WebGUI 7.5.x

[henryykt]

ls and export-branch (and maybe some other commands too) call WebGUI::Asset::getLineageIterator which is not available in 7.5.x. I managed to get them working by appending the code for getLineageIterator and getLineageSql (taken from 7.7.x) to the original 7.5.40 WebGUI source.

I don't know if wgd is intended to support 7.5.x. If not, do you mind me creating a fork to target 7.5?

ps. @haarg: wgdev rocks! Thanks for this great tool!