vncdotool should be usable as a library

[garretraziel]

I wanted to use vncdotool in my Python program for automation, but it was very difficult because of Twisted library and I ended up calling subprocess.call(), which isn't nice.

One should be able to import vncdotool and call its functions to communicate via VNC from Python programs.

[sibson]

@garretraziel let me know if the API in http://vncdotool.readthedocs.org/en/latest/library.html meets your needs. If not please re-open.

[garretraziel]

API looks pretty good (thank you!), but I have several problems with it. First of all, I am unable to create two clients in one program (call connect() twice). I think that this is still problem with Twisted reactor, but since I'm using it in my GUI testing tool, I want to create several virtual machines with different VNC ports and connect to each of them (see how I am using vncdotool client here http://git.jansedlak.cz/?p=infinity-f20.git;a=blob;f=xpresserng/vncutils.py;h=fc9dc525c7f6efc82789e414d92d8a57e45fb8ba;hb=refs/heads/libvncdotool).

Another problem is that virtual machine changes its resolution during boot, from 640_480 to 1024_768. When I have used vncdotool with os.system(), it worked (output images had 640_480 and then 1024_768) but when I use API and client.captureScreen(), resulting image is cropped to only 640*480 all the time, see attached screenshot.