#24 Unit and conversion tool
Proposal for the unit and conversions dictionary,  and added 3 query scripts and a demo workbook.
Please take a look and give your feedback

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' High prio TODOS:
' A) Check units and conversion factors thoroughly to make sure they are completely correct   !
' B) fix cost / integration outputs.
' C) Make values adjustable/overwritten (e.g. for costs), or make integration with opengrid.cfg file.
' D) Add unitttests (note: what are usefull tests? @saroele: Maybe you can put me on the right track? 
' E) Move functions to separate module (fluksoapi?) instead of genmodule. Should it be a class then? (note:I really don't understand SELF...)'

' Low prio TODOs (maybes):
' A)  Rework documentation to opengrid template
' B)  Add additional units, eg integration to other timebases or units (e.g. liter). 
' C) include day/night tarriff for electricity?
' D)  Add partial name matcher (eg util ='ele') to query_utility

"""