[pilot-db-list] example for link and linked fields (for documentation)

[hermann g. <hgr...@gm...>]

hi 2 all ;-)

i have proof readed the german translation of the documentation and i 
found that the link and linked data types are very misunderstandable.

so i created a graph to visualize that, if you think it's oK, you're 
welcome to include it in the documentation.

the only thing to mention about is that the datatypes of link and 
linked fields are always "string", so mathematical operations are not 
possible (as can be thought of by looking on the graph).

so long, ciao hermann