State a contiguous array of structs a function reads as an input array

[estebanzimanyi]

shape.inputArrays also names a single-pointer parameter MEOS documents as an array followed by a
by-value integer it documents as its number of elements: spanset_make(Span *spans, int count)
reads count spans, as npointset_make(const Npoint *values, int count) and
cbufferset_make(const Cbuffer *values, int count) read count values, where stbox_round(const
STBox *box, int maxdd) reads one box. The C type cannot tell them apart and the @PARAM text can:
attach_struct_input_arrays of parser/shapeinfer.py reads it through extract_param_docs of
parser/nullable.py, the Doxygen #extract_nullable reads, and records the array with its length
and its element as #_input_arrays records an array of pointers. An integer documented otherwise
(Index in meos_array_get) is no length. _signature_fits of parser/sqlfn.py passes no SQL argument
to the length of an input array, as to a bound parameter, so a SQL array fits the array by its
element and attach_claims_fit leaves a signature on the claimant whose array it fits:
Set_constructor's set(float[]) stays on floatset_make and leaves cbufferset_make.

Witness: on MEOS-API master e84319b over MobilityDB master 2a1d52a7ee the catalog states no
inputArrays for spanset_make, spanset_make_exp, spanset_make_free, npointset_make,
cbufferset_make, stboxarr_round and geomval_arr_free, so a binding takes the count for an
argument of its own and the typed Spark and Flink surfaces of JMEOS refuse spanset([]),
set(npoint[]) and set(cbuffer[]) as arity:sql; and cbufferset_make carries the signature
set(float[]) RETURNS floatset.

Measured over MobilityDB master 2a1d52a7ee: run.py states inputArrays for those 7 functions, of
143 single-pointer struct parameters followed by an integer, and removes set(float[]) from
cbufferset_make; every other key of every function equals that of master's parser. The suite
passes 520 tests with none skipped, among them the three of tests/test_shapeinfer.py
StructInputArrayTests and tests/test_claims_fit.py test_an_array_length_takes_no_argument, which
fails with master's parser/sqlfn.py.

Why: the catalog states what a function reads in a form every binding marshals, and the
documentation of a parameter is where MEOS states that a pointer is the first of several values.