Help for sending inline_images

PyLily has added support for inline images to be included in user and discussion
info, memos, and messages. Clients running the iTerm2 terminal emulator will 
actually see the images displayes right in their terminal window when the 
feature is enabled. Other clients will see a URL they can access to view the 
image.

Senders can insert images by using the markup [img source], where source is 
either a memo name or a URL to fetch the image from. As part of this support, 
memos can now include image or binary data in addition to text. These binaries 
can be uploaded using a new /memo upload command when running iTerm2, or be 
uploaded via SFTP or SCP. Other binary files can also be uploaded this way, as a
way send arbitrary files to other users. A /memo downloadp command can be used 
to access these files from iTerm2. These files can also be accessed using the 
PyLily web interface.

Recipients can control whether images are displayed inline or not and what size 
they are displayed at using the /set inline_images" setting, with options off, 
small, medium, or large.

A new review filter option of img has also been added, to match only sends which
include one or more inline images. The /review last command also now allows a 
count to be suffixed by "i" to indicate you want to that number of recent sends 
with images.

Using the multi-line send feature, multiple images can be included in a single 
message. info, or memo, intermixed with rich text and syntax formatting. See 
"/help sending multi_line" for details.

(see also: review, sending multi_line, settings display