Merge pull request #107 from holtgrewe/hotfix/mason_nightly_warning

[FIX] Fixing nightly build warnings in genomic_variants.cpp in MSVC.
[FIX] Reverting 308d5e which causes a regression with empty SWIFT pattern.

The new test in test_index_swift.cpp breaks without the patch in index_wotd.h.
Merge pull request #109 from holtgrewe/fix_regression_308d5e_master

[FIX] Reverting 308d5e which causes a regression with empty SWIFT pattern
[FIX] Not writing out empty lines to FASTA any more.

This happened if the line length was a divisor of the sequence length.
Merge pull request #111 from holtgrewe/hotfix/empty_line_write_fasta

Hotfix/empty line write fasta