since tables can be tricky, we now enforce that the compiler bails out
if the user tries to instantiate a table class manually.
Note that a bit of trickery is needed to keep the low-level unit
tests working...
also, this renames DeckItem::setInDeck() to DeckItem::wasSetInDeck()
because the former method can easily be confused with a setter method
(which it is not, it is a 'getter').
note that there is a small semantical difference now: the old
signatures specified the status of the whole *item* while the new
variants are specific for a single *data point* of an item. Though at
this point the index passed to the methods is still disregarded..
The purpose of this flag is to keep track of whether a keyword is
supposed to have only one element, i.e. scalar, or several. The
defaultApplied method only makes sense in the case of scalar items, this
method will now throw if it is called on a non-scalar item.
now the data is parsed from a string specified in the source file
instead of a separate file, the PvtgTable utility class is tested and
the order of the fields in the JSON definition of PVTG is the same as
for that of PVTO.
Parser::parseData is quite useful for unit tests to prevent them
spilling files to everything. Also, what was formerly
Parser::parseFile has been renamed to Parser::parseStream and slightly
modified to not be specific for std::ifstream.
