Reject BCF files when minor version doesn't match the current implementation.

[cmnbroad]

Fixes https://github.com/samtools/htsjdk/issues/1323.

There are 3 commits:

• one to fix the VCFFileReader tests to detect and report negative test cases that should throw but don't (I discovered this was broken when I tried to verify that the new test failed without my fix)
• one with the actual fix
• repair a broken javadoc reference

[codecov-io]

Codecov Report

Merging #1324 into master will decrease coverage by 0.003%. The diff coverage is 50%.

@@               Coverage Diff               @@
##              master     #1324       +/-   ##
===============================================
- Coverage     67.796%   67.793%   -0.003%     
- Complexity      8250      8251        +1     
===============================================
  Files            562       562               
  Lines          33639     33639               
  Branches        5641      5641               
===============================================
- Hits           22806     22805        -1     
- Misses          8658      8659        +1     
  Partials        2175      2175

Impacted Files	Coverage Δ	Complexity Δ
src/main/java/htsjdk/variant/bcf2/BCF2Codec.java	77.381% <50%> (+1.19%)	35 <0> (+2)	:arrow_up:
src/main/java/htsjdk/samtools/BAMFileReader.java	67.847% <0%> (-0.817%)	51% <0%> (-1%)