Support function and value names that require being surrounded by back-ticks

[GoogleCodeExporter]

For starters, need to consider spaces in names or names that are reserved words.

The following are not correct:

> let ``hello world`` = 0;;

val ( hello world ) : int = 0

> decompile <@ ``hello world`` @>;;
val it : string = "hello world"

> let ``goodbye world`` x = x;;

val ( goodbye world ) : 'a -> 'a

> decompile <@ ``goodbye world`` 0 @>;;
val it : string = "goodbye world 0"

Original issue reported on code.google.com by stephen....@gmail.com on 23 Apr 2012 at 2:39