Log message:
Import devel/libslang2 (version 2.1.3).  This is the current
version, and packages should switch to it as they are deemed compatible.
blurb:

S-Lang is a C programmer's library that includes routines for the rapid
development of sophisticated, user friendly, multi-platform applications.

The S-Lang library includes the following:

 -	Low level tty input routines for reading single characters at a
	time, as well as low-level terminal-independent routines for
	manipulating the display of a terminal.

 - 	Keymap routines for defining keys and manipulating multiple
	keymaps.

 -	High level screen management routines for manipulating both
 	monochrome and color terminals.  These routines are very efficient.

 -	Routines for reading single line input with line editing and recall
	capabilities.

 -	Searching functions: both ordinary searches and regular expression
	searches.

 -	An embedded stack-based language interpreter with a C-like syntax.

 -	A malloc debugging package