2 - libpnd: merge overrides, fix it up;
3 - full-replacement PXML is one option, another is
4 - apply override to all sections that match -- by unique-id, so apply override to all sub-apps that apply?
6 - libpnd: appdata-dir-name?
8 - mmwrapper black screen?
11 - .desktop in same place as .pnd, override category
15 - .desktop for deployment, for running from xfce
18 - honor render_mask to know what to update
19 - handle SD eject/insert? or leave on manual
21 - add callback to pnd_disco_Search (maybe new func to not break cpas code), so can show number apps found so far