added generateAtPositionIter and waitForServerIter, yielding the server's output line by line.
added generateAtPositionIter and waitForServerIter, yielding the server's output line by line.

arruda/pymclevel,arruda/pymclevel,mcedit/pymclevel,codewarrior0/pymclevel,mcedit/pymclevel,ahh2131/mchisel,codewarrior0/pymclevel,ahh2131/mchisel