upload: fix uploading by setting correct Content-Length

Previous setChunkedStreamingMode(0) enabled chunked streaming, ommitting a
Content-Length header. Recent nginx threw a 411 error at us.

Calculate the whole POST body in advance and use
setFixedLengthStreamingMode instead.
upload: horizontal layout for upload dialog
Manifest: don't export Intent for about activity
Manifest: target API level 17
comments
release-1.1.9