v1.2.0

• Adds missing sub-commands to manuals.
• Adds manuals to packages - Fixes static linking of libc in cli packages.
• Adds experimental concat sub-command to cli.
• Adds 'sav head' and updates 'sav rehead'.
• Adds --headers option to export and handles phasing header for VCF output.
• Improves error handling in vcf reader.
• Automatically appends .s1r extension to .sav files when running stat-index.
• Adds manuals for CLI usage.
• Uses compressed vectors for some conversions.
• Fixes options not being passed to sav writer in export.
• Copies some CLI options from import to export.
• Fixes handling of special info fields in sav export.
• Adds default info headers when export to sav format.
• Adds experimental filter expressions.
• Adds missing license notice.
• Auto generates some property fields and changes read_if behavior.
• Fixes PASS being removed in filter field.
• Removes extra conditions for rounding in sav reader.