Refactor findin/isin/etc...

[andyneff]

Having these functions in executable callable form was set up a long time ago, and is possibly unnecessary

Should all these functions be combined into one files, (maybe elements.bsh ?)

This can be done in two steps to maintain compatibility. First move to the new file, and leave the current existing findin, etc... with a deprecation warning (on source), and then remove those at a later date.

Thoughts? @scott-vsi

[scott-vsi]

I think ask_question should be included in this list as its executable signature is different from its functional one, which I think is actively harmful #275

[scott-vsi]

I never use the executable version. The biggest problem to me with moving them to a new file is that a different file would have to be sourced. You could get around that by making findin source elements.bsh or something.