MAINT: Remove use_header kwarg

[aburrell]

Description

After pysat 3.2.0 is the latest supported version of pysat, the use_header kwarg will no longer be needed.

Potential impact

• Is the feature related to an existing problem? This kwarg is currently used in some methods/utilities and in the unit tests
• How critical is this feature to your workflow? This will raise unnecessary warnings that may alarm the user
• How wide of an impact to you anticipate this enhancement having? Important for maintance
• Would this break any existing functionality? No

Potential solution(s)

• Update usage with a version check
• Remove entirely after pysat 3.2.0 is the lowest supported version of pysat.

Alternatives

Allow annoying warnings

Additional context

This was a temporary kwarg needed to ease users into a new Instrument and Meta data structure.