#285 add  and  builtins
Fix cut-n-paste in `leaf_paths`; doc and test 'em
Added `all` and `any` builtins
Merge pull request #296 from slapresta/all-any

Added `all` and `any` builtins
manual.yml: fix indent for the new `any` and `all` commands.
Merge pull request #300 from lcd047/master

Fix building of the manual
Add `?`, `.[]?`, and `..` operators

Make XPath-like `//a/b` recursive structure traversal easier in jq,
which then becomes:

    ..|.a?.b?

The `?` operator suppresses errors about . not being an array or object.
The `..` operator is equivalent to calling the new `recurse_down`
built-in, which in turn is equivalent to

    recurse(.[]?)

Note that `..a` is not supported; neither is `...a`.  That could be add
added, but it doesn't seem worth the trouble of saving the need to type
a '|'.
Initial add of math functions.
Remove non-standard exp10()
Add missing trig functions and barebones test
Add cbrt (cube root)