g.extension: only warn when non-essential files are missing #164
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Only warn, not fatal error, when CSS and logo files are missing
in the distribution. Tell user about the possibility of
missing a doc pkg. Tell what will happen next.
Also improve function and parameter names.
and switch to format and name vars in now more
complex tr string.
This is particularly useful when you don't have grass-doc package installed and you don't want to install it, but want to install modules using g.extension.