Update sdide.py

Last 48 hour, Added optional git toolbar, git --amend command in gitmenu, bash- and git-helpmenu. User gets popupmessage in Git settings window "New folder: gitsync". Updated readme. All git commands are run in gitsync folder. Other commands run in projectfile dir. Changed installpath for xwindows and unity reasons, any directory is now accepted, but you can't launch it from unity launcher..maybe someday I have time to do it.