Full support of age encryption

mktar-batch now supports non-interactive age calls, though I've added a
dependency on expect.

tarcat, tarls, and untar now know what to do with .age files. They also
now know what to do with Zstandard compressed files that use .zstd
(instead of .zst).

Big archival update

mktar now experimentally supports SHA256 checksums and age encryption.

mktar-batch is a version of mktar that strips out the 'clever' algorithm
detection and includes a batch processing/common passphrase mechanism.

Updated tests for mktar.

Quick fix to error text

Fix mktar

SHA1 checksum files were created regardless of existence of corresponding
file. Worse yet, they weren't actual checksums.

Fix unittest

Help text specified wrong option.

Formatting fixes; Help message fixes

Added core README; dropped one not-so-useful script

Refactored code into multiple 'packages'. One day these may be
independently installable. For now it's just an organization method.

Rewrote main README and added per-package READMEs.

Also: bug fix on whiched and whichvi. They formerly propogated an error
if $EDITOR or $VISUAL were set to a non-existant executable. Also
improved the inline documentation.

README formatting; refactor qemu-test; new git script

Updating my docker tools now that I use swarm

Remove temp test files

Refactor tests

Remove static test files

Slight refactor of a usage message

Add rmold and resetx

Specify full path to POSIX utilities; Clean up scripts' output

Fix typo

Fix to `epub` and `enumerate` rows in README

Added networking scripts (i.e. vpn*); Updated style of most scripts

Added wg*, fw*, docker*, android*, pactl*, vimsplit; Update to enumerate