Adding historic version of SSSS -- v0.1.
Adding historic version of SSSS -- v0.2.
Adding historic version of SSSS -- v0.3.
Adding historic version of SSSS -- v0.4.
Adding historic version of SSSS -- v0.5.
Incorporate B. Poettering's compile workaround.

Using a void* instead of the more precise function signature is
ugly as sin, so I'm using ifdef so people can enable this if it's
necessary for them.
Making use of stdout/stderr consistent.

Shares/reconstructed secrets go to STDOUT.
Warnings, errors, and informational messages go to STDERR.
Cleaning up minor whitespace sloppiness.
Adding option that makes failing to memlock fatal.
Updating readme.
Cleaning up whitespace/formatting to make flow easier to follow.
Some rather more pedantic whitespace cleanups.
DRYing up some of my conditional-compilation changes.
Adding basic install instructions.
Making build behave gracefully when doc tools aren't available.
Forgot one important prerequisite.
Adding some finer-grained build tasks.
Adding install task, and updating docs.
Adding separate man pages for `ssss-split` and `ssss-combine` so that users who try `man ssss-combine` won't be confused.
Ignore build artifacts from git.