add a count to the ID tag in new @PG lines to ensure ID is unique
Merge remote branch 'srl-local/devel' into devel
Refactor code for adding BAM header PG records (and only add a single record for spatial filter)
Merge pull request #6 from dkj/devel

Refactor PG BAM header record adding
bugfix - copy to uninitialised string rather than concat
Merge pull request #7 from dkj/devel

bugfix - copy to uninitialised string rather than concat
Merge pull request #51 from srl147/devel

add a count to the ID tag in new @PG lines to ensure ID is unique