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shasum seems more widely available than md5/md5sum, and we don't have to worry about dealing with the different signatures and output formats of md5 and md5sum then.

sysinfo outputs localized message labels, so we can't just grep for "OS Type". But OS is the first thing it outputs, so we can probably just grab those lines by line number. Switched to doing that.

For now this supports:
- Mac OS X
- Linux (presumably works on all versions)
- Cygwin (Windows)

This prevents it from malfunctioning when `setopt prompt_subst` is off.

A new "lib/compfix.zsh" script defining a new handle_completion_insecurities()
function has been added, which handles insecure completion directories by
notifying users of said insecurities and moving away all existing completion
caches to a temporary directory. While intended to be called at startup, this
function is generally callable at any time (e.g., for testing).

This helps catch issues with compinit and insecure directories.

ahead and diverged remote, I added ZSH_THEME_GIT_PROMPT_EQUAL_REMOTE.

Partially fixes #3614

This adds two new theme functions for git:
* `git_prompt_behind` works in a identical fashion to `git_prompt_ahead`
  and will output a format variable (`ZSH_THEME_GIT_PROMPT_BEHIND`) if
  the branch is behind.
* `git_prompt_remote` will output one format variable if the branch
  exists on remote (`ZSH_THEME_GIT_PROMPT_REMOTE_EXISTS`), and another
  if the branch is unpublished (`ZSH_THEME_GIT_PROMPT_REMOTE_MISSING`).

The old `git_prompt_ahead` has been changed. Using git log is subject
to formatting in .gitconfig, which can be overridden and will break
this function. Relying on rev-list is much more stable.

Add support for variant "utf8" locale suffix spelling. Fix dumb bug in iconv call that would cause it to hang.

For unspecified encodings, assume it's UTF-8 or compatible (e.g. ASCII) and muddle through without character encoding conversion.

Do not put explicit dot in $cdpath, since it causes problems on Cygwin due to an underlying zsh bug.

The -h options in l, ll, and la were lost in 25b1cd68. There's no reason
to remove them.

In termsupport, use LC_CTYPE instead of LANG to enable byte-by-byte text processing. LANG doesn't seem to actually work.

Remove terminalapp plugin and fold its implementation in to lib/termsupport.zsh. Replaces the redundant Terminal.app support that was recently added to termsupport.

LANG is a colon-separated list of prefered locales; LC_CTYPE is single entry,
therefore we need to remove all but one entry.

Also, there is no need setting it if it is already set (LC_ALL also sets
LC_CTYPE, so we check it too).

Move the DISABLE_AUTO_TITLE check from title() to the preX hook
functions that call it, to allow the title() function to be used
directly by user or other callers.