How to make an app distribution tarball

[phil-davis]

Currently the Makefile in various app repos has make dist and/or make appstore targets.
(sometimes both - e.g. owncloud/richdocuments#302 )

1. which is intended to be the "official" "standard" one?
2. do we delete the other one?

They get out-of-sync and end up producing tarballs with different contents because appstore works by putting everything into the tarball expect for a list of things to be excluded, but dist works by just putting in a positive list of what is wanted.

[phil-davis]

@PVince81 @DeepDiver1975 @micbar or anyone else
I guess there was some history here. It would be nice to standardize this rather than people wondering at release time if they should type make appstore or make dist
comments please.