Changed note on file permissions.

Minor edit.

Documented use of -q for multiline commands.

Documented -q.

Minor cleanup.

Note on multi-line results from execution variables.

Wrote section on execution variables.

Wrote Builtin Variable section.

Extensive reorganization and formatting updates. ...

Wrote intro sections on variables.

Minor updates and formatting changes.

Fixed typos.

Documented .define overrides for HOSTNAME, HOSTSHORT builtins.

Changed delimiters on HOSTNAME from <> to __.

Documented -l, the use of the '-' separator in -G operations, and further notes on sudo operations.

Added -E option to redirect stderr -> stdout and documented it.

Minor typo.

Documented -T and -a.

Added -K to synopsis.

Minor cleanup.

Documented -K, HOSTNAME, and HOSTSHORT. Updated copyright.

Documented the fact that test mode is now the default.

Added warning about permissions of transferred files.

General edits and cleanup.

Added note about -N canceling -k.

Documented variable substitution on the command line hosts and command arguments.

Minor edit in the Environment section.

Formattting fix.

Fixed typos and general editing.

Minor formatting cleanup.

Documented -t, -x. variable definitions, search paths, and did general doc improvement.