Minor fix in plugin err output
Calling improvements:

- fixed call -A to behave consistently with -c and -m
- call -c not to output non-ref alleles with no ALT allele
- support for the new symbolic allele <*>
- increase default prior from -mP1e-3 to -mP1.1e-3 to call
clear variants missed by previous default setting
- updated test files for the latest mpileup output (calculation
of QS has changed)
Added new test for annotate