more fixes for the downloaddialog

[Danilo Cesar Lemes de Paula]

More fixes for the download dialog.

The first one is an attempt to make it a bit more simple (the UIThread
was not really necessary). It also uses states to drive the UI.

The second one shows the error message returned by libdivecomputer.

A review on it would be nice.

Thanks, Danilo

--

The following changes since commit ab649e21ba07c9f572d61350b9217609f44f7f04:

  fix DownloadDialog behavior (2013-08-29 19:20:34 -0300)

are available in the git repository at:

  git at github.com:danilocesar/subsurface.git downloaddialog

for you to fetch changes up to b56e214e69c1af376dc114267dfb3aa0035518e9:

  improve DownloadDialog's error handling (2013-09-01 11:40:33 -0300)

----------------------------------------------------------------
Danilo Cesar Lemes de Paula (2):
      improve DownloadDialog UI control
      improve DownloadDialog's error handling

 qt-ui/downloadfromdivecomputer.cpp | 170
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++----------------------------------
 qt-ui/downloadfromdivecomputer.h   |  40 +++++++++++++++------------