[m-dev.] diff: enable --warn-interface-imports

[Thomas Charles CONWAY]

ON
> 
> Hi,
> 	Can someone review this one?
> 
> ===================================================================
> 
> Estimated hours taken: 3
> 
> Enable --warn-interface-imports by default. This was turned off while
> list and term were defined in mercury_builtin.m, since it caused many
> warnings. 
> 
> Fix all the unused interface imports that have been added since then.
> 
> compiler/options.m:
> 	Enable --warn-interface-imports by default.
> 
> compiler/module_qual.m:
> 	Fix formatting inconsistencies with module names in warning
> 	messages. (".m" was not appended to module names if there was
> 	only one module).
> 
> compiler/*.m:
> library/*.m:
> tests/invalid/type_loop.m:
> tests/warnings/*.m:
> 	Remove usused interface imports, or move them into
> 	implementation (mostly bool, list and std_util).
> 

This looks fine.

Thp,as
-- 
ZZ:wq!
^X^C
Thomas Conway               				      conway at cs.mu.oz.au
AD DEUM ET VINUM	  			      Every sword has two edges.