A new debugging tool: func_edit

From the console (type "con" into the Gap5 Error window) you will be
able to type "func_edit UpdateReadingDisplays", for example, to
locally change the function definition without needing to quit and
restart the program.

All changes are temporary.


git-svn-id: svn://svn.code.sf.net/p/staden/code/staden@3749 ba6f2710-ca9f-427c-89d3-5bf716dbc8e1