LoKiCore&LoKiNumbers: add new symbol HASDATA

Vanya Belyaevrequested to merge
vanya-hasdata-symbol-v0 into master

LoKiCore&LoKiNumbers

  • TES.h/.cpp
    • add new symbol HASDATA - DataHandle-based twin for EXISTS
    • change behaviour of SIZE : return -1 for non-existent data instead of exception (probably some flag/option here is needed) @sstahl
    • update a bit Doxygen comments
  • functions.py
    • add HASDATA symbol
Edited by Marco Cattaneo

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