Code cleanup and simplification

This release drops the requirement for cli package to be available in favor of our idiomatic use of flag package. Also simplifies the string cli implementation, e.g. options always come before the verb. For all command line programs you can use the input/output options with "-" as the name to specify explicitly to use standard input or standard output. This was implemented in some of the command line programs but not is implemented across the board. Drop parameters like generate-markdown, generate-manpage in favor of Markdown documents and Pandoc. "examples" is no longer a support option as the man pages supply examples directly as does the "-help" option.

This release include man pages in the release zip file. These can be copied into your MANPATH appropriately.