1. The debug file is located at /tmp/nnn_debug.
2. Debug mode is completely disabled by default. The debug binary `nnndbg` can
be built by running `make debug`.

^Q would quit even from filter mode

On Mac and error is thrown if the regex expression to regcomp() is empty.

Please refer to comments at:
c42df81ae5

1. Open directories in filter mode
2. Fix arrow keys not working after filter selection (due to invalid cur entry)
3. Support `Insert` key to clear filter prompt
4. Update documentation

Add Debian and Fedora package installation option.

Reasons:

gnome-search-tool is much more powerful than other tools in its category. It
supports numerous search parameters like size, modification date and supports
text search.