Various fixes#177

Merged

dnachbaur merged 5 commits intoBlueBrain:masterfrom

dnachbaur:master

Aug 9, 2017

Commits on Aug 7, 2017

Move sendSizeHints and sendData also to Observer
dnachbaur
committed

Commits on Aug 8, 2017

Allow uncompressed small tile sending
dnachbaur
committed

Commits on Aug 9, 2017

Catch errors regarding invalid JPEG quality values
dnachbaur
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Transform error message printing into exceptions
dnachbaur
committed
Throw on failed connection to server in stream ctor; refactor test deflect servers
dnachbaur
committed