String utility changes/additions

Hi,

I want to add some string utilities into CVS, but first I'd like to give a little info
and get feedback before I commit it.

Firstly, there are presently a few functions in Standard Libraries -> Shell Commands ->
String List Utilities that, as far as I can tell, seem to be in the wrong place or can
be generalized for better use.  So I just want to move these around and fix them up
to start with.

In there we have:
 glob
 split-words 
 merge-words
 read-lines 
 write-lines
 #P

"glob" is basically a matching function that can be used in other places.
A name like "matches" or "matches-list" is more appropriate.

"split-words" is really a tokenizer, albeit not a general enough one.
I have generalized this function and named it "tokenize", adding a delimiter parameter
that users can supply.

"merge-words" really merges any strings it is given, not just words (it has no logic
to determine whether it is given words or not).  Actually no merging is done at all
by this function, rather a new string is created. I propose a "merge-strings" name 
instead.

"read-lines" reads from a file and is out of place by its name being next to "write-lines".
Should probably be renamed to something like "read-file-lines".

"write-lines" and "#P" seem okay for now.


I believe these should be in libstd/strings.lsh and have a help entry under 
Core Interpreter and Startup Library -> Strings -> String Utilities.

As for the code in shell.lsh that corresponds to these, I can just make those functions
be aliases for the ones to be in strings.lsh (with requisite parameters as needed).

Cheers.

Raymond

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