cvx - convert array/string to procedure
array/string cvx -> <proceduretype>
(hello) cvx -> <proceduretype>
Alternatives: Function cvx_a for arrays (undocumented)
-> behaviour and synopsis are the same.
docu by Sirko Straube
/builddir/build/BUILD/nest-simulator-3.3/nest-simulator-3.3/lib/sli/typeinit.sli