This is consistent with --scroll-step (option name) and --zoom (percentage)

* fixed for simpler parenthesis matching

* absolute file path for .fehbg, moved script creation into helper function

* Removed unused variable.

* added early exit condition as per Ferada's suggestion

* Added enum for options to improve readability

* migrated options to enum.

* added support for zoom specification through options

* added man entry for zoom-rate

* added help entry for zoom-rate commands

* updated man to have warnings about strange values for zoom options

* fix memory leak (free exec_absolute_path)

* added detection for path vs env PATH launch for use in .fehbg script gen.

* Added enum for options to improve readability

* migrated options to enum.

* added support for zoom specification through options

* added man entry for zoom-rate

* added help entry for zoom-rate commands

* updated man to have warnings about strange values for zoom options

* Update help.raw

removed zoom-in/out

* removed zoom-in/out from options

* updated man/help entry to remove in/out zoom specification

* sanitize --zoom-rate in options parser; use a single variable for storing it

Co-authored-by: Daniel Friesel <derf@finalrewind.org>

This lets `feh` draw the background pixmap of an existing window,
opening the door for use with tools like `xscreensaver` or `xsecurelock`

Closes: #124

Passing an empty string to the --geometry option will enable fixed geometry mode without having to specify anything else

See #278

Uses the camera-generated thumbnail to display RAW images that could otherwise not be loaded.

Closes #218

This introduces a new feh_should_ignore_image function which is called
at appropriate places in those modes to skip images which are loadable but
undesired.

This option allows you to change the default imlib2 image cache size of 4 MiB.

Closes #326

Fixed(?) Makefile document build issue for README.md

Many image collections are organized by directory, so it is nice to have
jump-to-adjacent-directory navigation.

e.g. Given the following file hierarchy:

    .
    ├── A
    │   ├── 1.jpg
    │   ├── 2.jpg
    │   └── C
    │       ├── 1.jpg
    │       ├── 2.jpg
    │       └── 3.jpg
    └── B
        ├── 1.jpg
        ├── 2.jpg
        └── 3.jpg

`feh --recursive` creates the following filelist:

    A/1.jpg <---- current_file
    A/2.jpg
    A/C/1.jpg
    A/C/2.jpg
    A/C/3.jpg
    B/1.jpg
    B/2.jpg
    B/3.jpg

If we press [next_dir], we move the current_file pointer to:

    A/1.jpg
    A/2.jpg
    A/C/1.jpg <-- current_file
    A/C/2.jpg
    A/C/3.jpg
    B/1.jpg
    B/2.jpg
    B/3.jpg

Pressing [next_dir] again moves the pointer to:

    A/1.jpg
    A/2.jpg
    A/C/1.jpg
    A/C/2.jpg
    A/C/3.jpg
    B/1.jpg <---- current_file
    B/2.jpg
    B/3.jpg

[next_dir] now moves the pointer back to the top of the list:

    A/1.jpg <---- current_file
    A/2.jpg
    A/C/1.jpg
    A/C/2.jpg
    A/C/3.jpg
    B/1.jpg
    B/2.jpg
    B/3.jpg

Pressing [prev_dir] from here moves backwards to the first image of the
previous directory:

    A/1.jpg
    A/2.jpg
    A/C/1.jpg
    A/C/2.jpg
    A/C/3.jpg
    B/1.jpg <---- current_file
    B/2.jpg
    B/3.jpg

When starting from an position that is not the first image of a
directory, [prev_dir] moves the pointer to the first image of the
current directory.

These actions combine well with `--sort dirname` since all regular files
in a directory will be sorted before any subdirectories, avoiding a
filelist like the following:

    A/1.jpg
    A/SUBDIR/2.jpg
    A/SUBDIR/3.jpg
    A/4.jpg

With `--sort dirname` that filelist becomes:

    A/1.jpg
    A/4.jpg
    A/SUBDIR/2.jpg
    A/SUBDIR/3.jpg

* Added an --insecure option to disable host/peer verification in libcurl.
This allows feh to load images on HTTPS hosts with self-signed certificates.
For security, this is not the default.

* Fixed an include in show_usage.

The following adds the ability, when using `feh` as a background setter,
to use a specific Xinerama screen to render a provided image. Along with
the provided '--bg-*' option, the '--xinerama-index' argument will be
used to identify the index of the detected Xinerama screen to use.

Signed-off-by: James Knight <james.d.knight@live.com>

Patch by sdaau on IRC. Thanks!