[Nano-devel] do_browse_from() bugs.

[David Benbennick]

Do ^R, type /does/not/exist, then ^T.  Hitting Enter will crash Nano.

Also, make an unreadable directory.  Enter its path at the Insert File
prompt, then do ^T.  Again, the browser is mucked up and will crash.

The operating directory was not checked when opening the file browser. 
With nano -o $PWD, you can type /foo/ at the prompt, then do ^T to open
the file browser.

Finally, if you just type a directory name at the prompt (for example from
the Nano CVS directory, type "po") the browser should open there.

These bugs are fixed by changing do_browse_from().  I had to add a
function readable_dir() to check whether a directory can be opened.

dobrowse.patch
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