biology/{bcftools,htslib,samtools}: update 1.2.x -> 1.3

• Update ports to 1.3 and set BUILD_DEPENDS of dependent ports to require version 1.3 of htslib.
• Add CURL option to htslib
• Add TEST_TARGET with perl and bash dependencies for testing
• Tidy up spacing and pkg-message's

PR: 205524
PR: 205525
PR: 205526
Submitted by: cartwright@asu.edu (maintainer)