Added support to fix a memory leak in mkIAU

[atrayano]

Types of change(s)

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Trivial change (affects only documentation or cleanup)
• Refactor (no functional changes, no api changes)

Checklist

• Tested this change with a run of GEOSgcm
• Ran the Unit Tests (make tests)

Description

This is needed to fix a memory leak in mkIAU

Related Issue

[tclune]

See suggested fix for log message and a question about MAX_FORMATTERS

[tclune]

I've reverted MAX_FORMATTERS. In a separate ticket we can explore the consequences of changing the value.