1.15.3-AK2

This is an unofficial maintenance release of the nom-tam-fits Java library for handling FITS images.

The official base repo has been abandoned for years now, accumulating a number of pending pull requests with various bug fixes. The purpose of this release (and indeed the attipaci/nom-tam-fits fork) is to not let those bug fixes go unheeded, and provide a way to make the fixes available for an improved, up-to-date version of the library.

The main fixes in the 1.15.3-AK2 release are:

• Added scientific notation
• Improved control of header card ordering, especially when editing
• HIERARCH keys enabled by default
• Checking and removal of illegal (non-printable) ASCII characters
• Fixes to subsecond precision timestamping
• FitsDate equals, hashCode, and compareTo implementations
• No more Logger warning on multiple CONTINUE keywords
• Fixed up broken maven build
• Migrated to Github Actions and Codecov.io for CI.
• Various other small fixes and improvements.