Update ace editor

Using https://github.com/ajaxorg/ace-builds/commit/45d3068aa7190f08396bcfe134e505fe144c1ccb
Patch ZMI to use ace editor (work in progress)
Introduce a new script to check a python script using pyflakes

returning a result that ace editor can understand
Check python scripts on the fly and display annotations
ace editor : enable autocompletion