Faster filelist.c:get_line_color() for slow links
Faster check_link_is_dir() for slow file systems
Faster directory listings for slow file systems
Add primitive implementation of autofs option
Rename utils.c:{begins,starts}_with_list_item()

Also:
 * use better parameter name
 * add function comment
Use split_and_get() in starts_with_list_item()

Instead doing something similar but differently.
Use absolute link target path in check_link_is_dir

This is required for more robust check for slow fs.
Resolve symlinks to same slow fs
Document new abilities of 'slowfs' option

SF bug report #47.
Merge branch 'add-autofs-to-slowfs'

Extend 'slowfs' option format to allow path prefixes (in particular,
it's useful for autofs).

Thanks to Евгений Жаров (a.k.a. ezharov).

SourceForge bug report #47.