Hi,

	I added a Ignore command to acme to let it ignore
files matching a regexp when listing dir contents. I use
it to keep the window of my kernel source dir with just
the source files;
but I think it's also marginally useful to
hide ugly dot files on windows browsing unix directories.

The usage is simple:
	Ignore regexp:	ignore matching files
	Ignore:		don't ignore anything
regexps are those of regexp(6).

I attach the changed files here.

By the way, why doesn't acme use regexp(2)?
Shouldn't we converge to regexp(6)?
Just wondering...