Large rewrite of the tinybsd script.
Large rewrite of the tinybsd script.

This allows the user to specify that the root filoesystem should be
an MFS or teh actual medium itself.
Also a new command syntax, along with an interactive mode by default,
with crossinvocation memory of the last used values as defaults for the
current invocation.

Submitted by:jmeloatfreebsdbrasil,com-br

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