add a warning if the optional PGPLOT dependency is not available #149
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This warns if PGPLOT is missing when is not installed because optional
dependencies can be skipped at installation. This gives users a clear
notification of why their code will not load.
Mithaldu++ for bringing up the issue on the #pdl IRC
http://irclog.perlgeek.de/pdl/2015-09-15#i_11219756.
CC: @wchristian
Branch note: This branch is a WIP. It still needs tests and Travis-CI support. Anyone else is welcome to move it forward.