decoder should fail on missing descriptors

[cpb]

Tests/BUFR/is_winide_BLDU.bufr, among other things, uses local descriptor 0-01-204 which has no entry in the current default tables. So the test fails, generating a gibberish decode. The decoder should fail as soon as it encounters a descriptor for which it doesn't know the data bit width.

[vanh souvanlasy (vanh-souvanlasy)]

most of the BUFR test files in Tests/BUFR uses the local descriptor 0-01-204,
so more than half of the tests will fail the same way (unknown descriptor).
To continue using these test files, The tests will need to be changed by using local table B to run the tests.

[vanh souvanlasy (vanh-souvanlasy)]

A local table B has been added to tests suite. It contains all the local descriptors used by the BUFR files included in the tests.
This local table B is now used by in tests scripts to allow currently defined tests to completed as before.
Also added is a test which outline the decoder new behavior of aborting the test when unknown descriptor(s)
are found.

[vanh souvanlasy (vanh-souvanlasy)]

decoder now abort if an unknown descriptor is found

[Yves Pelletier (yves-pelletier)]

This behaviour needs to be modulated by the presence of an operator 206YYY immediately preceding the unknown descriptor. In this case, there should simply be a warning that an unknown descriptor of width YYY has been skipped and that decoding is continuing.

[cpb (chris-beauregard)]

I knew there was a reason why I chose the specific wording of "for which it doesn't know the data bit width" when I created the bug report...

[vanh souvanlasy (vanh-souvanlasy)]

now check for preceding descriptor for signify data width operator before rejecting an unkown descriptor.

[vanh souvanlasy (vanh-souvanlasy)]

By allowing unknown descriptors following 206YYY operator, validation need to be done on that descriptor to make sure it follows the BUFR descriptors definition FXXYYY of acceptable values.

[vanh souvanlasy (vanh-souvanlasy)]

this was fixed in 0.8.2 before release date 12/02/2009