libslax-0.22.1

• sdb: Add "info insert", "info output", and "info locals" commands
• docs: Add "what's new in 1.1"
• psu: Add #include of <stdarg.h>
• Add LICENSE file
• docs: Add docs for crypto:* extensions
• docs: Add example; fix examples to use "main"; add links to libxslt equivalents
• bug: Add missing check when moving sd_cur
• docs: Add os:remove docs
• docs: Add simple intro
• docs: Add slax-1.2 "what's new"
• docs: Add targets for sphinx
• docs: Ensure two spaces after periods
• docs: Expand tabs in output; fix bug with wrong line number
• Fix copyright
• docs: Fix lists and admonitions
• Fix use of AC_ARG_ENABLE, where I was assuming "yes" instead of using $$enableval
• docs: Move documentation to Sphinx/RST (WIP)
• ext: Teach sysctl code to handle arrays and use kernel's type information; the kernel mechanism to do this (BSD) is not pretty, but I attempt to be as safe as possible
• bug: Test for NULL ctxt when running new "info" commands (insert, output, locals)
• add SLAX_MVAR_PREFIX
• add checks for xsw_usage.xsu_total and dev_t
• docs: add link for #!
• docs: add reference card link; add emacs info
• test: add test case for #44
• bug: avoid using "asm" for GCC < 5 (#42)
• future: checkpoint libxi work
• bug: fix #44 by calling ALL_KEYWORDS_ON at appropriate places
• docs: s/External/Additional/
• set version and release to "development-branch"
• slaxExtDecode needed a "const"
• gt: turn fancy "git log" to "gt clog"
• update tests for fixes in libxslt-1.1.29
• use python3