Add "ZX_" to more constants
Ported be038c7 from ZXing

Original commit message: "Try a diagonal cross check in PURE_BARCODE
mode for QR codes to avoid false positives. HT fics.danmark"
Ported d7c7807 from ZXing

Original commit message: "Refactor a little bit of result parsing
(mostly, a test commit)"
Ported 42cfa9c from ZXing

Original commit message: "Closes Issue #37 : don't respond to (invalid?)
UPC-E codes that aren't 8 digits"
Ported 077ae83 from ZXing

Original commit message: "FindBugs inspection -- part of a test commit"
Ported 9567698 from ZXing

Original commit message: "Small commit for issue #27, and part of a
test"
Ported 7169d1a from ZXing

Original commit message: "More FindBugs changes as part of test"
Ported 7199f4a from ZXing

Original commit message: "Closes Issue #27 : add basic character set ECI
support in PDF417"
Ported c42131e from ZXing

Original commit message: "Issue #41 : Handle null barcode metadata in
PDF417 in corner case"
Ported dddc1c4 from ZXing

Original commit message: "Move to use of Java 7 NIO2 APIs"
Ported 5d5a8e2 from ZXing

Original commit message: "Handle invalid VIN-like data in Code 39
barcodes"
Ported 937d087 from ZXing

Original commit message: "Delete old test gen code"
Ported e3d6c3e from ZXing

Original commit message: "Allow all long-ish ITF code lengths, as the
result is very unlikely to be a false positive, and there are apparently
a number of uses of long-ish ITF codes of various lengths out there.
Allowed lengths are now interpreted as allowing those lengths and
anything longer than the largest allowd length."
Ported 78e2ac4 from ZXing

Original commit message: "Update WhiteRectangleDetector.java

Changed image-only version of the constructor to calculate an
appropriate initSize based on the image dimensions."
Ported 670e238 from ZXing

Original commit message: "Modified WhiteRectangleDetector

Continue expanding the rectangle until at least one black point has been
found on each side, instead of stopping immediately when all sides
are white - which might still be inside the barcode."