Drop function kw

[mgree]

A variety of scripts use the function keyword to define functions, which isn't POSIX. This PR drops that keyword from all scripts except for other/circular/sq.sh (I wanted to preserve that for evaluation).

It's not an issue per se---these scripts are already in bash, so there's no serious harm in having it there... except I was using those scripts to test the libdash bindings, and it broke them.

[github-actions]

OS:ubuntu-20.04
Fri Jul 1 01:09:30 UTC 2022
intro: 2/2 tests passed.
interface: 38/38 tests passed.
compiler: 54/54 tests passed.
agg: 109/109 tests passed.

[github-actions]

OS:ubuntu-18.04
Fri Jul 1 01:09:34 UTC 2022
intro: 2/2 tests passed.
interface: 38/38 tests passed.
compiler: 54/54 tests passed.
agg: 109/109 tests passed.

[github-actions]

OS = Debian 10
CPU = Intel(R) Core(TM) i7-8700 CPU @ 3.20GHz
Ram = 15752
Hash = 3f5bc4f
Kernel= Linux 4.15.0-167-generic x86_64

benchmark	tests	passed	failed	untested	unresolved	unsupported	not_in_use	other_status
posix	494	375	41	31	6	40	1	0
intro	2	2	0	0	0	0	0	0
interface	38	38	0	0	0	0	0	0
compiler	54	54	0	0	0	0	0	0
aggregator	109	108	1	0	0	0	0	0

[github-actions]

OS:ubuntu-18.04
Fri Jul 1 01:15:27 UTC 2022
intro: 2/2 tests passed.
interface: 38/38 tests passed.
compiler: 54/54 tests passed.
agg: 109/109 tests passed.

[github-actions]

OS:ubuntu-20.04
Fri Jul 1 01:18:09 UTC 2022
intro: 2/2 tests passed.
interface: 38/38 tests passed.
compiler: 54/54 tests passed.
agg: 109/109 tests passed.

[github-actions]

OS = Debian 10
CPU = Intel(R) Core(TM) i7-8700 CPU @ 3.20GHz
Ram = 15752
Hash = e5a27bb
Kernel= Linux 4.15.0-167-generic x86_64

benchmark	tests	passed	failed	untested	unresolved	unsupported	not_in_use	other_status
posix	494	375	41	31	6	40	1	0
intro	2	2	0	0	0	0	0	0
interface	38	38	0	0	0	0	0	0
compiler	54	54	0	0	0	0	0	0
aggregator	109	108	1	0	0	0	0	0

[github-actions]

OS:ubuntu-18.04
Fri Jul 1 14:46:56 UTC 2022
intro: 2/2 tests passed.
interface: 38/38 tests passed.
compiler: 54/54 tests passed.
agg: 109/109 tests passed.

[github-actions]

OS:ubuntu-20.04
Fri Jul 1 14:48:29 UTC 2022
intro: 2/2 tests passed.
interface: 38/38 tests passed.
compiler: 54/54 tests passed.
agg: 109/109 tests passed.

[github-actions]

OS = Debian 10
CPU = Intel(R) Core(TM) i7-8700 CPU @ 3.20GHz
Ram = 15752
Hash = 2db5932
Kernel= Linux 4.15.0-167-generic x86_64

benchmark	tests	passed	failed	untested	unresolved	unsupported	not_in_use	other_status
posix	494	375	41	31	6	40	1	0
intro	2	2	0	0	0	0	0	0
interface	38	38	0	0	0	0	0	0
compiler	54	54	0	0	0	0	0	0
aggregator	109	108	1	0	0	0	0	0