Merge pull request from GHSA-686w-5m7m-54vc

decNumberToString calls for a buffer that can hold a string of digits+14
characters, not a buffer of size digits+14.
We need to allocate an extra byte for the NUL byte.

-10E-1000010001, for example, will be stringified as -1.0E-1000010000
and decNumberToString will currently write an extra NUL byte after the
allocated buffer in the heap.

Originally reported by @SEU-SSL on GitHub.

Ref: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=64574

Fixes GHSA-686w-5m7m-54vc

Add setlocale() call (fix #1740)

Improve handling of non-integer numeric indices (fix #2815)

Update `bug_report.md` with Discord link

Release jq-1.6

Restore JV_PRINT_COLOUR as an alias

JV_PRINT_COLOUR was part of the public libjq headers and was removed as
part of 2d05b54. While JV_PRINT_COLOR is definitely the preferred
spelling this side of the pond, we shouldn't just remove otherwise
exposed enum values.

Update AUTHORS

Add autoconf outputs (fix #916)

Fix make dist (fix #870)

Fix warning in util.c