docs: Fix link to chdkcamera source
Update installation.rst

Add some extra dependencies information. Give me a nod, and I will happily update the installation information more structurally.
docs: Refer to distribution package for PySide
docs: Add PySide installation instructions
chdkcamera: Get bInterfaceSubClass from cfg, not dev (should fix #20)
chdkcamera: Disable match for CHDKCameraDevice class for now

This match would shadow matches from the more specific subclasses (i.e.
A2200). This will be re-enabled once there's a way to rank matches
according to specificity (i.e. always select the matching class with the
shortest inheritance tree back to SpreadsDevice).
workflow: Fix exception handling in download step (Fix #18)
chdkcamera: Don't catch exceptions
during download (A2200)
Add option to disable parallel capture and download
Add icon
gui: Fix progressbar values
Merge remote-tracking branch 'upstream/master'
Add commandline-flags from postprocess plugins (fixes #24)
Merge remote-tracking branch 'upstream/master'