Add setlocale() call (fix jqlang#1740)

Improve handling of non-integer numeric indices (fix jqlang#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 jqlang#916)

Fix make dist (fix jqlang#870)

Fix warning in util.c

Add lib.h to dist file list