Make --bounding-box less ideosyncratic

[redmer]

The current v1 parameter is a bit ideosyncratic, with its space separated values, not using abbreviated bbox.

Proposal:

1. rename to --bbox, rename --bounding-box-crs to --bbox-crs.
2. change valuespace in accordance with https://docs.ogc.org/is/17-069r4/17-069r4.html#_parameter_bbox to comma-separated values

This is expected to be a breaking change? Or allow both types of values.

[redmer]

Note that the order in --bounding-box is WESN; in ?bbox= is WSEN.

Suggestion:

1. --bounding-box deprecated: "w e s n"
2. --bbox: "w,s,e,n" or "w,s,_,e,n,_"